I did try Circus Ponies notebook which came from the same Next heritage I think. Never quite felt convinced somehow. The Mesh solution does leave a copy on the server too with OneNote of course (and I guess it would with Notetaker on OS X since Mesh works with that too). At some stage MS are supposed to flip the switch on a web version of OneNote as well which would let you open the same notebook in a browser, Sounds clever but I can't quite see any use for it personally, though doubtless others will feel differently.