Scott Hanselman has posted a very interesting blog entry about organizing the code for software projects.
A particular interest in the post is the use of NTFS Junction points. It could be usefull for sharing version information (take versioning out of AssemblyInfo.cs and put it in a shared file using junctions).
My own projects are organized in a rather hectic way which currently makes the process of building and releasing much more complex than it should be.
Note to self : Organize Sharp3D's code :)