If you're building SharpDevelop from our Subversion repository, you might already have noticed it: The trunk of the repository now contains SharpDevelop 2.1 (Codename "Serralongue").
Changes in the 2.1 line so far: The Subversion AddIn was reactivated (note that it does not work on x64), a Boo interpreter pad was added, the docking library was updated and now supports VS2005-style "dock helpers", and you can now choose the target framework version for VB projects.
Our wiki gives more information on how to get the code from the repository; the build server will build the 2.0 line only for the moment.
If you are already using the repository but want to stay on the 2.0 line, you will have to switch your working copy using this command:
svn switch svn://sharpdevelop.net/sharpdevelop/branches/2.0/SharpDevelop
Bug fixes are committed to the 2.0 branch only and every week they will be merged back to 2.1. New features will be added to 2.1 only.