Good to see this is back up. I used it fairly often pre expansion. Of course then it was Zedric who got me to liking WoWhead post expansion. For Kaliban's though, I like that it has some features that WoWhead doesn't. For the big raid instances, it breaks down the drops from each boss into potential priority for different classes. Of course this is still subject to interpretation depending on the raid but I can still how it would be helpful.
However I noticed the mousover effect to see the stats of some items seems wonky, and not showing the stats, or you'll only see it for a millisecond or something.