Hi Varga,
I am sure I had seen Ubuntu earlier (https://wiki.ubuntu.com/GoogleSoC2009/Ideas) because there ideas weren't mentioned on their website earlier, but now that you mention I can't find it either.
Thanks for the information, Leslie. Can you tell us if there are any other organisations who have withdrawn from GSoC '09? Also, if any of the rejected organisations will be chosen for participation in there place.