I just published an analysis of the enterprise bookmarking/tagging market. You can read it on EWeek here. I think I've hit everyone in the market, but if not drop me a line in the comments below and I'll add ém next time around.
My short take: Enterprise bookmarking is one cool technology that should help employees of already open, flat companies collaborate better and more effectively. Enterprise bookmarking and tagging though hinges on group collaboration, which requires enough individuals to achieve a network effort. That means a large user base or or at least a small, but active user community, and all but requires removing the sorts of barriers you find in some financial institutions, for example. That's going to be a tough sell (more like a non-starter) in highly regulated industries.
But even in those organizations who aren't regulated or particularly hierarchical, getting user-participation will be a challenge to adoption. Users don't bookmark or tag out of the goodness of their hearts. They do so because creating a log of important sites helps them. Only once that point is internalized will they feed an enterprise-wide bookmarking system.
What this says is that IT need to be exquisitely sensitive to the interface of these systems. "We're struggling with tagging even though there are some of us who think there's tremendous power [in the technology]," Clark Ritchie, director of Web development and information technology told me. Clark runs Jive Software's Clearspace, a tagging system, in his enterprise, which while not supporting bookmarking yet has similar human-interaction requirements. "We need the tooling to make it so stupidly easy that it takes off. "
Enterprise bookmarking systems are still far from making their systems so "stupidly easy" that they just take off. I list a number of the features in the story that are missing from today's systems, but suffice it say most have enough holes to make soliciting user participation a huge challenge. At the very least, users should be able to bookmark and tag site from the toolbar and not pop an additional screen to fill in the necessary details about a site.

