Two for the bookmarks
Some of this information has been available for a while, it just hasn't been easy to locate. It actually still isn't ;-) But at least these two links look like they might be more or less permanent. 1) Sitecore 6 Release Notes Gives you all information about known current issues. A big help, which should help you avoid getting too stuck trying to solve a particular issue - only to find that it is already known, and in some cases even comes with a workaround. 2) Sitecore 6 Change Log Detailed information about the individual updates, so you can now be confident when choosing whether to go with the Recommended Release or the Latest Release.