Have you ever had a hard time deciding if a library or tool is going to work once you really start using it? This wiki exists to help developers research their options and/or document problems that have wasted their time in the past. Check out Tom's blog post for a longer introduction, or look at jquery, sqlite, or zlib to see some examples.
Here is some of the content that has already been added. For a list of everything, included pages that other users have requested, check out the Wishlist.