DonationCoder is holding a big C++ contest with many categories you can enter. Everyone that enters will get something, even if their project doesn't win.
This contest has some really good sponsors and the prize list is pretty cool.
Deadline for entry is
July 14, 2006 August 14, 2006*, so head on over there and check it out and enter. Not that many have entered yet so right now your chances of winning are pretty good.
Even beginners have a chance of winning. You can enter the small utility category if you have an idea and feel like learning something. So if you have been putting off learning C/C++ now might be a good time to start hitting the books.
*deadline has been extended another month, for those that aren't quite ready and to give others a chance to still enter