Got one of these for Christmas and am highly impressed with it so I thought I would stick it up here incase anyone is teetering on the edge of iPad or Android tablet.
Currys and Comets have the tablet at £399 but CarphoneWarehouse is running a free upgrade to 32GB If you go via them (don't forget Quidco) plus Samsung are also running a £200 "entertainment package" incentive which includes 50 MP3s, 15 films, 7 games and £25 of eBooks from various providers.
The Galaxy is a 7" Android tablet that shows up the iPad in many areas. Features include micro SD socket, front and back camera, plays flash, is a mobile phone, Kindle reader, SatNav, great speakers, good battery, half the weight etc.
More details about the tablet can be found at http://www.samsung.com/uk/galaxytab/
Comparison table of Galaxy v. iPad is at http://www.pcworld.com/zoom?id=204779&page=1&zoomIdx=1