I'm looking for the best solution for the current Google algorithm. Currently I have "noindexed" all of my tag and category pages. I'm trying to prevent pages from being indexed that don't provide much value. If this really the best possible solution? Should I allow index on one and noindex the other. I'm really looking for opinions and first hand experiences. I know I could try each out but I'm looking for real advice. The site I'm trying to tweak is a shopping cart site. If that makes a difference.