My proposal for the Google Summer of Code 2009 was accepted! I will be working on Drupal, specifically completing work on the Version Control Integration API with the goal of allowing Drupal to switch from CVS to a DVCS (most likely Git) for its main version control.
It will be a difficult task, but much of the baseline work has already been done, so I will be mostly filling in the gaps in functionality and finishing up the few areas where the Git backend lags behind the CVS one. You can look at my proposal here, and I will endeavor to make relatively frequent status updates on this blog. I am chrono325 on Drupal.org, and will try to spend some time on the #drupal irc channel on freenode, so if you have questions, that's how to get in touch.
Yay for Google!