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PS: 5. Would be -> do SEO for the best converting keys

I do not know a tool, that predicts conversion rates. But if you see, that a competitor is doing heavy link-building on a page / key, it is very likely, that it is converting well

You could try this just with Open Site Explorer here at SEOMOZ. Check the domain of a competitor -> click on "top pages". You will see the most linked to pages.

Check the titles of those pages and with a high probability you will have his top converting keywords.

We do excactly that. We have a wordpress installation with 50+ niche blogs and another with 5 magazines. It has many advantages, to use the same codebase. And even to use the same theme as we do on:

http://www.naanoo.com
http://www.techboom.de
http://www.stylingqueens.de

because, every step towards better usability, crawlability etc. helps all your sites.

If all you sites are conform with the Google guidelines i don't see any problems doing so. Our experience with it is good.

We have a 4-step-process for keyword-discovery:

1. we do a brainstorming session and collect all keywords, that come to our minds
2. we create an adwords campain an run all these keywords / phrases in broad match
3. we keep only those combinations, that convert well
4. we use "spy tools" to collect our competitors keywords / phases and restart with them at 2.

Yes!

1. Go to http://www.opensiteexplorer.org/

2. enter the URL of the competitor

3. click the "top pages" tab

Voila!

Nightly regards from Germany

Sebastian

We used W3 Total Cache for about 2 years. But there was a problem with recent versions of this plugin.

The cache is cleared every time, we posted something new.

We have 100.000+ posts in our WP-database. And each time (100+ times a day) we published something, it cleared all our cache objects. (at least in disk-caching mode -> no matter, what settings we used)

So we switched to Quick Cache. This plugin is way simplier. But it does the job for us.

PS: As we are Germans, we use Sistrix, Searchmetrics, WISE for discovering the keywords of our competitors. I have no suggestion for the us/uk-market. But I hope SEOmoz will offer a keyword tool in the future

Is there a funktion / tool, that displays domain data like:

Domain Authority
Domain MozRank
Domain MozTrust
No. of Links
No. of linking Domains

historical?

Internal duplicate content can hurt your rankings. You waste link power on the copies, that should promote the original.

If your software generates variations, i would insert a rel=canical pointing from all those variations to the orginial.

http://support.google.com/webmasters/bin/answer.py?hl=en&answer=139394