Yesterday during the Mozilla love-in, Gadgetopia reader Tomas hipped us to the Bookmarks Synchronizer Extension. I hadn’t heard of it before, but it’s a great extension. Basically, you give it an FTP site, and it will upload a copy of your bookmarks. Add it to another copy of FireFox (at home, for instance), and you can use it to keep the two copies in sync.
It also has an option to only synchronize a folder instead of the whole bookmarks tree. That would be a great way for a team to share a common list of bookmarks. I work with a group of folks who are all learning .NET. Whenever someone finds a site with good information, we e-mail the links around to each other. The bookmarks extension would be even better.