How to "SEO" Handle Tags, Merchant, Price Searches pages?

[cashnow]

Hello,

This one is directed at Eric and Stefan, but I would like to hear other opinions as well.

There are a ton of new pages listed as tags, merchant search, term search, etc. (My XML sitemap is picking them up) How are you guys handling these when it comes to SEO? Are you place no index meta tags or are you leaving them and letting Google (and the others) figure it out?

I just have never been sure about pagination pages. Even a category page has many pages with the same Header information. In my Webmaster Tools, they suggest I have too many duplicate title and meta tags.

Any thoughts? Any are appreciated

Thank you!