MarkJaquith
Mark has been handling for the most part, the 2.0.x line (and from my understanding, will continue to do so after 2.1′ release), and outlines the files that need changing for this upgrade. Primarily a security fix, with a few bug fixes (including quicktag support, among others), this is a highly recommended upgrade.
That said, a minor bug appeared with this release, affecting a few users on random occasion with their feedburner feeds. As usual, this bug was quickly found, and also as usual, Mark has quickly released a fix. This post outlines your options in handling this issue. I would really like to take a second to personally commend Mark on his forthrightness about the issue, and quick response. As he states in the post regarding the Feedburner issue, he’s willing to accept a little criticism regarding the bug in the hopes it brings a few more beta testers to the fold. With the scores of different server configurations out there, testers really are the heart and soul of any stable release, and the more people who subscribe to the wp-testers mailing list, and actively participate, the less chance a bug of this nature slips through. This is a perfect example of how even non-technical members of the WP community can contribute. Simply having a test environment set up on your sever (always a good idea for testing plugins, themes, etc), installing beta and RC installs, and reporting back feedback can further the process. As he said, the more eyes, the less chance of these bugs.