Noticed a strange behavior last night...I had installed a driver for a USB to Serial adapter cable so that I could upgrade the firmware on a Harman Kardon AV receiver. This was for windows XP SP3 and I am running snow leopard on 24" imac with 2.66 Intel Core duo and Parallels 4.0. Installation of driver went with out a hitch, but when I launched the firmware update application for the AVR it also launched iTunes at the same time! I tried to quit iTunes and it did, but it would re-launch by itself. Tried to quit itunes several times but it wouldn't quit. I ended up just minimizing it and proceeded with the AVR's firmware update without any problems. I think I had to Force Quit iTunes. But I haven't had any other problems with snow leopard or parallels. Just my experience.