If you do a search on Google for: "site:yourQ2Asite.com", you'll see a bunch of results that you don't necesarily want to show up. For example, the /questions?start=10, /questions?start=20, etc. And /tags?start=10, /tags?start=20, etc. Along with same for categories, etc.
Can anyone recommend a good robots.txt file that will keep Google and other search engines from indexing redundant data?