I regularly use Fabric. After deploying a couple of projects with it, I have come up with a standard deployment layout and stack. Now its as simple as "fab deploy" and "fab revert". Thank you fab!
Same here, except I've set things up so that any changes I make to my project are automatically synced instantly to a live staging domain, and I don't have a revert command (although I do back up copies of previous deployments). I also keep apt and pypi dependencies in project-local config files and have a refresh command that updates those packages on both the remote and local machine along with some other stuff. I think I might have overengineered things a little.
If it helps, "li" is my current project's code name.
The vast majority of the code is concerned with configuring a fresh Linode, not pushing recent changes (for that, see the rf and stage functions, and the functions they call). I hate system administration. The only way I could make myself configure my server was by writing a script to configure it for me.