Dropbox works very well. To keep notes and to keep them synchronized, I use Tomboy + Dropbox. LifeHacker has pointers on this.
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I've been using Dropbox for several months now, and I still like it. I have it installed on two computers, a desktop and a laptop.
UPDATE: Linux Install.
Just thought you'd like to know: Dropbox has doubled the amount of storage you get when you get Dropbox. I wonder if I can now fit my photographs on dropbox without resizing and compressing them first?
I had been a apple computer user for the past 5 years and immensely enjoyed the hardware and the software. But, all good things come at a price. Apple's price for a polished user experience has lately turned out to be user freedom.