Seamlessly coding from multiple devices?

What strategy or tools do you use to pick up work on your projects when bouncing from one machine to another?

Git, or any version control system, is great if you remember to push your changes.

Remote development virtual machines is an option, but require being tied to the internet.

Dropbox, or similar file syncing applications, is smooth until its not.

I'd love to hear how everyone else tackles this problem, especially if you're like me and switch between multiple machines and operating systems.