Colourful UDK-powered 4-player co-op tower defence RPG Dungeon Defenders has a demo! You can get it here. I've not had a chance to play this yet, but given how pretty it looks, and the fact that I am a sucker for tower defences, I might just have to have a crack. I've also posted the most recent trailer below for your perusal.
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Lions and cards and hexes, oh my
We've been talking, and we think that you should wear clothes
Total coincidence, but we sell some clothes