FoxMarks lets you synch your Firefox bookmarks with a central server and keep various machines (office/home, PC/Laptop/Zonbu) in synch. It also means if any one of them goes walkabout on you you don’t loose your bookmarks.
Quite frankly, this is the kind of functionality I would expect for my Zonbu bookmarks already, given the online storage/cachefs approach Zonbu takes. But hey, you can’t have everything.
In the mean time, hot rod your Zonbu with FoxMarks.
-Mr. Zonbu
Real life with the Zonbu Mini-PC 
Perhaps Zonbu should switch Firefox for Flock? Flock comes with built in support for syncing bookmarks with delicious as I’ve understood and also comes with many other features that could be useful on the Zonbu in the web-2.0-world.
Maybe old and discovered by others, but Google have climbed on a similar (and enhanced, as you’d guess) bandwagon here:
http://www.google.com/tools/firefox/browsersync/index.html
Not just your bookmarks, but history, passwords & cookies too!