Here is what we do:
- Each dev has a VM that is configured like our integration server
- The integration server has space for Trunk, each user, and a few slots for branches
- The production server
- Hooks are in Subversion to e-mail when commits are made
At the beginning of a project, the user makes a branch and checks it out on their personal VM as well as grabs a clean copy of the database. They do their work, committing as they go.
Once they have finished everything in their own personal space they log into the integration server and check out their branch, run their tests, etc. When all that passes their branch is merged into Trunk.
Trunk is rebuilt, the full suite of tests are run, and if all is good it gets the big ol' stamp of approval, tagged in SVN, and promoted to Production at the end of the night.
If at any point a commit by someone else is made, we get an e-mail and can merge those changes into our individual branches.