Wishing for better support for the Canon PIXMA MP600 / MP600R printer. Right now, I'm using the TurboPrint driver which works fine on a 64bit box with 2GB RAM. But it crashes on more bigger print jobs on smaller boxes. It's been suggested to use the iP4100 driver (iirc), but that driver does only support up to 600dpi prints, no duplex printing and have no special photo-paper support which matches the MP600. For decent photo printing on photo paper, you simply need at least 2400 dpi.
I'm willing to help out testing and tweaking a driver, if someone provides the guidance for doing so.