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I "noindex" all tags (actually I don't use them, but if I did I'd noindex them).
On my categories, I only allow page 1 to be indexed. Page 2+ are all noindex but dofollow so the juice flows. It's autogenerated and not valuable to search users, but Page 1 is useful and I added static content there so it's not only autogenerated.
I also tell Page 2, 3, 4.... to say that Page 1 is their canonical URL.
Dofollowing Page 2+, interlinking, the sitemap, and backlinks keep all of the pages crawled perfectly without me cluttering up the Google Index. Panda looks at these kind of things. Opinions may vary, and that's mine.
@Ryuzaki
Alternately, what do you think about setting viewable posts in a category to something like 99999 posts, thus there is only 1 page in the category? Right now some of my categories have 75 - 100 posts, causing a bunch of category stuff to show in serps.