I have been using Bookmark Sync and Sort for a long while now because I want the same bookmarks at home as at work and probably and a laptop and so on. But this has never been good enough, some glitches when Firefox crashes (well, it happens a lot) and bookmarks aren’t uploaded and then I start Firefox and.. BAM, download an old bookmark file. Bookmark Sync and Sort uploads or downloads when you start up or close Firefox.
Now I found GMarks, this uses Google Bookmarks, gives you a nice toolbar, searchable, and has the ability to set labels and so on. Very very nice, exactly what I want. Only downside so far is that it uses Google, I’d like to have the same features but use Webdav or something similar to have my bookmarks at my own server.
But hey, if Google want my bookmarks I’ll support them. 
Yes, writing a lot on this blog I am.. hrm.