BeanStalk is a hosted subversion system which has a lot of goodies, among which are integration with BaseCamp and Lighthouse. The app allows for easy repository set-up and management—existing repositories may be imported, or you can start out with a fresh slate.
Collaboration tools enable tracking of recent changes, comparison of revisions and changesets. Both paid and free accounts are available. Paid accounts include SSL, password encryption, daily backups to Amazon S3 and hosting on MediaTemple’s Nitro servers. Free accounts come with one repository, two users and 10MB of space. Registration can be achieved using OpenID.
BeanStalkApp.com In Their Own Words
“Beanstalk is a hosted Subversion system, making it easy for anyone to setup, browse, track, and manage Subversion repositories. Beanstalk has built-in integration with your favorite tools such as Basecamp, FogBugz, and Lighthouse.”
Why BeanStalkApp.com It Might Be A Killer
BeanStalk, besides its clean and crisp interface, offers easy to use version control. They’ve got collaboration features and integration with popular tools—all for free.
Some Questions About BeanStalkApp.com
How well does it work? Pricing for paid accounts? 
