A bit off topic perhaps, but for those of you who haven't seen it yet, Dragon Models has come out with a line of very nicely detailed, pre-painted 1/72 scale radio controlled tanks. These are much better quality than many of the Radio Shack/toy store type tanks I've seen on the shelves. You can probably see it in action at your local hobby shop, but Dragon has some info on their website (a bit slow though).
So far they've released two early versions of the Tiger I, with several more variants to come (and hopefully eventually some Russian and allied armor), but for the moment means you can't quite stage a good tank battle with your buddies (well, that and the fact that there's only two frequencies available, reducing the size and scope of your battles by a large margin).
Radio range and run times are decent (10 minutes approx so far) considering the transmitter uses a single 9 volt battery, with about 15-20 minute recharge times for the Tiger on the included display pedestal (4 AA's in pedestal to recharge). Forward speed seems relatively scale, though the thing can neutral steer like nobody's business.
The only 'weakness' I've seen so far is that the tank occasionally throws one of its rubber tracks (instruction manual recommends removing the tracks when not in use, presumably so they don't get over-stretched).
Granted, these aren't quite cool as Tamiya's 1/16th scale tanks with their infra-red battle systems, but then again, the Dragon Models Tiger I fits in the palm of your hand, and runs 50-80 bucks, as opposed to nearly 700(!!!) for the Tamiya setup.
The Tigers should be available at your local retail hobby shop (or one of the online shops like VoyagerToys) now, with more models to come. I suppose theoretically, one could build nearly any 1/72 scale plastic tank and probably adapt it to use Dragon's transmitter and receiver, but then, that would probably mean destroying the rather nice Tiger model that it came installed in.
Anyway, its fun to chase pets around the house with, and otherwise entertain yourself while waiting for the latest patch to download.