[hotshothenry]

one of the better google maps mashups that i've seen

[mrtron]

Really?

I would say one of the most useless mashups I have seen. It is about as exciting as watching paint dry.

[sgibat]

Probably the best I've seen is the same idea applied to anonymous wikipedia edits: http://www.lkozma.net/wpv/ Not sure if this has been posted.

[chaqke]

check out the map on the right side of http://www.buzzillions.com/

real-time view of customer reviews at a couple hundred retailers.

[ojbyrne]

It doesn't handle zooming in and out very well - it should remap already displayed products - but, yes, pretty cool.