>>>I've been trying to find a way to do this, but the only thing that seems to act this way at all is the ToolTips. Not a way I can find to use that. Anyone done this or have any ideas?
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>>I see Gary has given you a technique that sounds like it will work. Out of curiosity, do you want the popup form to receive focus or just hover off to the side somewhere? Receiving focus might not be that great from a UI perspective. A user who simply passes the mouse over a grid, accidentally or on purpose, might not want to be tossed into a new form. And s/he might get dizzy if the mouse passes over a range of grid cells, a whole series of forms opening and closing. Asteroids!
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>Just a hover. Just want to show information on the selected record. I'll build a timeout into it so it disappears after a so many seconds unless the mouse moves over it. It would be extra cool if I could make it fade in and out too. Have to look into that.

It's a bit complicated problem. There is a cool and complex implementation of the ToolTipText in grid on the Russian website foxclub.ru which I tried to use in one of my latest projects for the similar idea...