Should I allow index of category / tag pages on Wordpress?

[SEOKeith]

Quite simply, is it best to allow index of category / tag pages on a Wordpress blog or no index them? My thought is Google will / might see it as duplicate content? Thanks, K

[EGOL]

I have two wordpress blogs and category pages are where most of my search engine traffic enters.  Some bring in thousands per month.  Most of my post pages bring in very little traffic.

If you are not having any problem with duplicate content at present maybe it would be a good idea to allow indexing of the main page, the post pages and the category pages.  They if you do have a duplicate content problem you can remove from the index the pages that bring in the least amount of traffic.