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I think the footer is the best way to interlink the websites in a non-obtrusive way for users.  This should make your main corporate site your top linking site to each subdomain - and this is something you should be able to verify in a tool like Google Webmaster Tools.  I do not have any specific examples to support this, but this is a common web practice.

This is not 100% related, but Google recently suggested using Footer links as one way to associate your web content with your Google profile account:

http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=1408986

So you can figure if Google looks to footer links to associate authorship - they would likely do the same to relate sites together.

Just did a spider of your website and you have way too many subdirectories on those pages, which make it less likely for search engines to crawl and index the page.

For example:  http://www.movstore.com.br/Departamentos/+Quarto/86/0/0/0/0/0/0+40+Data/

By having 9 subfolders you are suggesting to search engines the Department content is buried deeply into your website and less relevant.

By comparison, you product page only has 5

http://www.movstore.com.br/Produto/Quarto+Infantil/Guarda+Roupas/Ponte+Juvenil+Teen+Branca+/6417/

Based on this directory structure, search engines think this page is more important than your category pages.  Anyway you can reorganize the content the product pages would be below the category-level pages instead of under their own product directory? For example:

/Category

/Category/Product/Sub-Product/Product-Name?

Interlinking is definitely a factor - but content is what matters.

Take the Disney brands that live on Go.com:

Espn.go.com

Abc.go.com

Abcnews.go.com

They all live on Go.com but Google surely knows they are really separate sites that cover different topics.  Same for any blogspot.com, typepad.com, etc. hosted blog.  The millions of blogs there cover a wide range of topics and search engines understand that they are not related just because they share the same host domain.

On the other end of the spectrum - if your site just has two subdomains - let's say www.website.com and blog.website.com ... which cover the same topics and link to one another, search engines would more likely associate those two addresses.

Yes - I believe your blog would look less-biased if it linked out to other useful websites.  Some people will say you should "nofollow" those external links so you don't "bleed" your page rank, but I don't think that is beneficial in today's SEO.

That said - try to avoid to any overtly commercial sites that might run competitor advertisements through programs like Adsense.  It's a bad habit for blogs to just link to the first site they find through Google searches.  It's always better to link to a known brand like NY Times than a low-quality eHow.com type site.

If you have other pages other than your homepage, I would link to the most relevant piece of content you have based on the the context.  You don't want to just link to your homepage in each blogpost.  The more specific and descriptive you are, the better.

You should link to your own blog - better for your users and you'll pass some link authority to your blog, which hopefully will then have a better to chance to rank for search terms your main website may not have visibility on.

If nearly all the links of your Blogspot blog just point to your homepage - the value of those links will just be reduced anyway.

I've seen great SEO benefit on linking internally from client's blogs - even if they are not on the same domain.

thanks Rand - just today, I noticed Google is finally back to displaying the correct URL.  We didn't do anything in particular to fix this so looks like it took about three weeks for Google to self-correct it.

Whenever the homepage of my client's homepage appears in Google results, the search engine is not showing our URL as our domain, but instead a partner domain that is linking to us.  (The correct title and meta description of our homepage is showing.)

I believe this is caused by the partner website (with a much higher pank rank) linking to our homepage from their footer to a URL with it's own domain that 302 redirects to our homepage.

Example:

Link:  http://www.partnerwebsite.com/?ad2203

302 redirects to:  http://www.clientwebsite.com/?moreadtracking

The simple fix would be for the client to ask for removal of the 302 hijacking link - but they are uncomfortable with  this request since they had requested it prior, and their relationship is not the best.

Is there any other way to fix this?

You should link to your own blog - better for your users and you'll pass some link authority to your blog, which hopefully will then have a better to chance to rank for search terms your main website may not have visibility on.

If nearly all the links of your Blogspot blog just point to your homepage - the value of those links will just be reduced anyway.

I've seen great SEO benefit on linking internally from client's blogs - even if they are not on the same domain.

Interlinking is definitely a factor - but content is what matters.

Take the Disney brands that live on Go.com:

Espn.go.com

Abc.go.com

Abcnews.go.com

They all live on Go.com but Google surely knows they are really separate sites that cover different topics.  Same for any blogspot.com, typepad.com, etc. hosted blog.  The millions of blogs there cover a wide range of topics and search engines understand that they are not related just because they share the same host domain.

On the other end of the spectrum - if your site just has two subdomains - let's say www.website.com and blog.website.com ... which cover the same topics and link to one another, search engines would more likely associate those two addresses.

Yes - I believe your blog would look less-biased if it linked out to other useful websites.  Some people will say you should "nofollow" those external links so you don't "bleed" your page rank, but I don't think that is beneficial in today's SEO.

That said - try to avoid to any overtly commercial sites that might run competitor advertisements through programs like Adsense.  It's a bad habit for blogs to just link to the first site they find through Google searches.  It's always better to link to a known brand like NY Times than a low-quality eHow.com type site.

If you have other pages other than your homepage, I would link to the most relevant piece of content you have based on the the context.  You don't want to just link to your homepage in each blogpost.  The more specific and descriptive you are, the better.