Enterprise content management is big business — a $3B industry, as a matter of fact, says Koral CEO Mark Suster, but it’s only at a 5% penetration. Lately, he said, there’s been a big increase in sites to help consumers manage their content, as we all know. Korallogo But what about the majority of businesses who still have a hard time dealing with all their stuff? Koral is out fill that gaping hole with a web app that looks a lot like a consumer Web 2.0 app. The DEMO folks describe it as “a lightweight, document-capable, user-focused content management sytem.” It’s totally free for busineses now, in the consumer vein, but moving toward enterprise work group licensing. It’s hassle free to contribute to, says Suster, and “you can collaborate with any group — the others don’t have to be on your system.” The app is self-built AJAX, and is “super fast,” says UI designer Jon Levine, “which was our first priority.” The app lets you subscribe to documents, authors, or tags. The UI is very, very nice. It’s in limited beta now, and you can invite your friends if you’re lucky enough to get in…

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