Flightradar24.com
I don't see 'radar' screen shots, so I' assuming this product is the data service only. A mapping client is still needed.
The dump1090 app has a 'network' mode. I'm not sure if its TCP30003 compatible (required by the above product). If not, the developer might be willing to add that support.
At any rate, if this $20 dongle proves to be any good at all, we might be seeing more coverage by amateur spotters.