A couple of good blog entries about SourceGear Vault and Subversion being used for source control by solo developers.
Mike chose to use Subversion for his Virtual Cellar Application. I suggest you check out Mike's post on Subversion and follow his progress as he develops the application. Some pretty cool stuff.
Scott has a post about installing Vault for the first time and about how he has become a source control believer.
Like Scott, I have SourceGear's Vault installed on my main development machine. However, I have always wanted to install Subversion as well to get some experience with it. I will try to install Subversion this weekend on the laptop as I don't have any version control software on it yet.