I just found a great product, Vault.  Vault is a source control system written entirely in .NET.  The main advantage of it is that it's easy-to-use, and also important, easy-to-setup.  I tried using VSS, really, I did!  But wow, it's really poor.  Getting things working correctly even on my local machine was a pain, not to mention on the LAN or over the Internet.  Vault took all of 5 minutes to install on an Internet-based development server, and works quite well -- as well as anything that has to interface with VS.NET can.  As well, if you're just looking for a system for your local machine, it's free for one user.  Very cool!