Dropbox 0.6.507 is Out
After a significant chunk of time, Dropbox released an update to it's multi-platform client: 0.6.507. The release notes say that there are a few issues fixed with Mac OS X, but I haven't run into any yet, and I've used it to keep three machines in sync. It's really quite simple, and at the same time, quite impressive. It's the way software should function - do something well and stay out of the way.
If you want to keep a folder in sync across multiple machines and platforms, give this a try, it's really quite amazing.