Tagsearch Technologies, a UK startup, now offers Tagseasy for the enterprise. It’s a pretty slick interface that lets you bookmark and rate pages without having to leave your toolbar. That can be mucho important when successful deployments hinge on quick user adoption. Unfortunately, tagging requires you to pop up an additional screen.
Judging from the website it looks like the product is offered as a service and possibly an appliance. It's unclear as to whether its segments tags and bookmark based on external permissions. A call to the company to confirm was not returned.