Nail on the head. Dropbox let's me be dumb too, but in clever ways.

I've been using it since the invite only beta and It. Just. Works. It was exactly what I was looking for: file synchronisation that gets out of my way. I had tried .Mac (now MobileMe) and found it to be too fussy.

The other beauty of Dropbox is that there is no fear of being locked in to their service. If they came crashing down I would still have all my files backed up across however many computers I am keeping in sync. Oh yeah, backups for free.

Finally, one nice trick I discovered on my Macs is that I can symlink my Address Book, Calendars and Safari Bookmark directories in ~/Library to a directory within Dropbox. Now I have my contacts, etc synced between my computers without any fuss.