Sync notes between Android phone and Ubuntu?

I just use text files in a Dropbox folder, in conjunction with Dropbox clients on "real" computers and the Android Dropbox App on my phone. Simple, but it works really well. And if you need something more sophisticated, using .doc files and .xls files with OpenOffice (on the PCs) and DocumentsToGo (on the phone) also works very well (DocumentsToGo is the only Android app I've paid money for, but there's nothing free to compare with it).

There is an app for Android called Tomdroid which had experimental support for web syncing and seems to be close to making a new release. See this thread on the tomdroid mailing list.