C++ and Python would be the two most common languages used for n900 development, Qt is the GUI framework and Nokia offer a Qt SDK as a free download (a little like Visual Studio) and is targeted at c++ programming, however Python bindings exist (the PyQt project) to do the same thing for those who would prefer to use Python. Have a look around the development wiki for more in-depth advice on that.

I'd imagine so. Qgil said it was an alternative for those who cant make it, well if you don't want to go then I guess you can't make it.. Nokia can't push you on a plane Once it gets to that stage and the contest has ended, it'll be between Maemo/Nokia (representative(s)) and the winner to sort out what they want to do and the specifics.

lol hmmm ok, well I guess that's up to paypal, though it might cost you more in fees. Im not sure what the minimum transaction amount is with paypal tbh.