Not necessarily -

Alot of PRWebs high authority distribution network is Nofollow

Also just because it is picked up, does not mean it is not duplicate content - or will not be treated as dup content in the future

Over the past few years I have personally seen a massive depreciation of Online Press Release distribution "White Hat" SEO benefits.

I also am not sure I would agree post Panda/Penguin - that Press releases are a good way to pass "Link Juice"

I am not saying it is a lost cause, but just feel your assesment is a little circa 2009, 2010

"Google uses spell checking software to check queries against common spellings of each word. When we determine an alternative query that we think might improve the search results, you'll see "Did you mean: (more common spelling)" at the top of your search results page. For example, if you search for [ foot ball ], at the top of the search results page, you'll see "Did you mean: football," a more common spelling of the game's name. Please note that our spell check feature is completely automated, and we cannot make manual changes to individual queries."

http://support.google.com/websearch/bin/answer.py?hl=en&answer=1723

So I would say in the case of Businesses, it is still algo based, (no manual interaction available) and predictive based on search volume and alternate queries available in predictive algo and spell check software?

It is situational

301 = Permanent Redirect - and better for SEO purposes as this tells the search engine that the redirected page has become the new page

302 = Temporary - Search engines of course follow the 302, I even think it will show the new page in results, but if it is a permanent, and you are worried about this - then use a 301.

Tough to give any kind of reason for use other than that above without some situational knowledge

But to a user, it is does not matter wheter it is a 301 or 302, but to bots the above differences apply.

And as a 404 I would assume it is a 301 - but not sure, due to I do not know the reason for the 404

For reference

http://www.seomoz.org/learn-seo/redirection