I've got a couple, one is being used as a learning tool for Python and general Linux type stuff.
The other is awaiting the arrival of a Gert board so I can get into some electronics tinkering.
Order them way back in March and received them in the first week of June.
They have their foibles, USB is a bit of a dark art, but the foundation is working on it and things have been improving. RaspberryPi.org forums are useful for information.
The MagPi is a nice online magazine, very reminiscent of the sorts of magazines that were around in my ZX-81 and Atari 600XL days. Contains project walk throughs and listings.