what is the problem? I put a vfat on a 8GB usbstick and put a 6GB matroshka movie file onto it... well preserving rights doesnt work but hell format the internal as ext3 and extend your windows to make use of it! I do have dual boot windows and linux and none of my partitions are fat, a transfer partition with music and movies is mounted with windows startup (just one to keep the overall journal mess to limits I can work with), as long as windows doesnt freeze I have no problem to recover the journal while booting into linux

I read somewhere that the n900 was already tested for 32GB cards and 64GB cards successfully but having class 2 cards doesnt work for me... 16GB class 6 will be my choice 14GB ext3 2GB vfat (just in case), the 29GB left on the device will be formated to ext3 every transfer larger than 2GB to a windows machine (which doesnt want to install ext3 programs) has to go wifi and I dont care...