I implemented this on my Mac Mini 2.4Ghz C2D (which is on all the time)
Canon:
MP150 (connected via USB)
HP
Laserjet 6P
Photosmart D7260
My wish is that this would work without needing a Mac. The two HP printers I have are both network printers with static IP addresses (the 6P is using a parallel-to-ethernet adapter). Would be nice to be able to print directly to them without having this hack work around.
I almost bought one of the newer HP ePrint printers, but once I read about how I needed to print to it (sending an email to the printer), I decided to check out other options. Really happy with this solution, but would like it to go one step further and print direct without needing a Mac.