Chipmark (www.chipmark.com) is a cool bookmarking site that lets you share your bookmarks between multiple browsers seamlessly. (Bias alert: I've been advisor to the chipmark group for the past three years.) Chipmark is written entirely by University of Minnesota undergrads, and distributed free of cost either as a server the students maintain, or as open source code that anyone is welcome to use to run his own server. The most recent release of chipmark supports shared folders among buddies, and will be out Real Soon Now. Check it out!