We seem to be getting a little R-Pi following (soon to be me included, Thanks to the help of an awesomely awesome friend
). I've been doing a little reading, as you do, so I know how to get started once my little slab of silicone arrives. For anyone wishing to do the same I would recommend the MagPi. A.... errrrm..... Mag for the Pi.
http://www.themagpi.com/
Read the first issue and it seems pretty good.
Also,
http://www.raspberrypi-tutorials.co.uk has some good beginner info for starting programming with Python if your interested in this part of it. I certainly will be. The Python language seems pretty easy to learn and quite forgiving. By that I mean things like variables don't have a declared type. You assign it a number, it becomes a number, you assign it "some Text" it becomes a string variable. Most languages will through a paddy with this giving a type cast exception or similar.
PyGame looks to be a pretty simple graphics library that the kids should have some fun with too.