As noted by the previous posters (who posted before I could finish this :)): Voyeur (on the SVN & files.wowace.com).
As the ZealotOnAStick states, its more of a replacement for GoodInspect & InspectorAce (the previous Ace inspect mod) than SuperInspect. Two large differences: it doesn't cache items yet as SuperInspect does, so you need to remain within inspect range to continue to view a person's items. And it doesn't provide the total armor/weapon set stat bonuses.
If you want all the extra SuperInspect gives you, with the corresponding increase in memory & CPU used, someone has made a branch of it that is currently working fine in WoW 2.0.6 (English). Same name as the official one, but updated frequently since Smurfy's last beta and it works without problems: http://wow-en.curse-gaming.com/files/details/5992/superinspect-smurfy/