That's definitely cool. Are there any docs for that "upload" API?
It's good to see people find solutions to the problem Yahoo! is causing.
Ahh I see according to http://lnkr.mobi/bm/google_bookmarks_api/ that is about all the docs on that API there are, and it doesn't support annotations/notes. Mine doesn't either, but it's a one line change to make it do so.