[calvin]

We recently migrated from self-hosted SVN repositories to GitHub. It's proven quite beneficial in terms of allowing access to developers at off-site locations. With GitHub's use of SSH keys for authentication I haven't had to worry much about security, and as far as disgruntled employees go it's easy to revoke access to the repository (i.e. set it up so everyone has their own GitHub logins and then you can add/remove access as needed).