Using the 2002-12-12 release:
I went through the KDE wizard to setup my HP PSC 750, and that went smoothly. Printing the test page however, didn't.

After rooting around the /proc/bus/usb, I noticed the permissions might be wrong. I tried to change it using chmod, however I have permission denied due to a read only fs.

If I could only get this HP PSC 750 working properly on my parent's machine! I didn't even dare try scanning !

Hmmm "Persistent Home CD" seems to solve some USB issues, although nothing is mentioned about printers...