I posted about this over at OCC, but oddly enough I never got around to posting about it here.

oSync is written in Python and uses the personal file space on my.opera.com to store files. This is the second application I’ve done in Python, so please be indulgent. Also remember to backup your bookmarks and check this page for updates – oSync is still in its testing phase.

More information about it can be found in the Opera forums and there are some screenshots here.