I'm interested in doing a site in Drupal 7 - rather than downloading the periodic source releases I'd like to grab the latest changes to Drupal using a version control system, be it CVS, SVN, git, etc. I'm not necessarily going to be contributing a module, though that might occur in the future. Any other developers out there working with the bleeding edge of Drupal? How do you stay up to date?
There are CVS instructions and Git instructions on Drupal.org. You just need to use the appropriate revision to work with Drupal 7. As Drupal.org is in the process of moving from CVS to Git, I wouldn't recommend SVN.
Also, Drupal 7 is in beta, very close to stable release. "Bleeding edge" normally implies unstable, which isn't the case here.