This is a two-man pop-up tent, similar in execution to the Gelert Quickpitch tents. Where this excels though, is that it's two-skinned rather than just a single skin (so far less condensation I'm led to believe). It's also waterproof, whereas a lot of the quickpitch ones aren't that hot in the rain. These are £65 on Amazon at the moment, so I think this is a really great deal, and ideal for festivals.
http://www.youtube.com/watch?v=kL0Tu6-oeOk - how to 'pitch' the tent and put it away again. Looks pretty easy.
http://www.amazon.co.uk/review/R3CCVAVVR16MMO/ - really good review of the tent, breaking the features down far more eloquently than I'm managing to do here :P