[JKT]

Camino 1.0.3 is able to import OmniWeb 5 bookmarks. In Camino go to the File>Import Bookmarks... menu and select OmniWeb 5 from the menu and import. I assume that the Camino bookmarks files are compatible with Firefox, so you should just be able to copy them between profiles if you prefer to use Firefox over Camino.

Btw, what happens if you just install OmniWeb on the thumb drive - you should be able to run it from there (however, the support files will be created in the ~/Library/ folder on the hard drive of your work machine so this might not be appropriate).