May I suggest Links, available from files.wowace.com ?
But what you're asking for is quite complex to do correctly now without tainting the UI, so there's very little chance any addon will do it.
You bet ;)
I just tested it, it seems to be quiet complex.
However it includes comparing of items, which my tekKompare already does, (much better if U ask me), as this mod greys out the current item that I'm wearing :S
Also it has a alt+click function, and an ordinary click function, that I don't quite understand.
I'm better of sticking to ManyItemTooltips I think.
Thank you for the suggestion tho!