Looking on all posts regarding USB printing, it seams to be a general point that isn't solved for all of you. I will not invest more time on this (1 day to try a lot of hints from the forum is enough), I think that has to be solved from parallels people. By the way: I like the software, all the rest works great (I was using Virtual PC for many years, Parallels is better!). Some informations about the problem: OSX printing is ok with my Canon Pixma MP810. I was not able to get it working with Bonjour in Windows XP. The printer is visible in the connected USB devices, but now way to print. I connected a GPS watch (Suunto X9i) and everything just worked perfectly (data transfer to the tool, even data transfer to Google earth), so it seams not to be the USB integration that isn't working, it's only the printer not working.