Yea, they're horrible.
I bought a HP Deskjet 340 (with battery, IR and Mac adaptor, the lot) some years ago.
I used to be proud of this portable color/bw printer, and that I could use it on Macs and PCs.
Then I progressed to Mac OS X and my new iBook.
The wasted effort, trying to find out if an adaptor for USB could be got! (The existing Mac adaptor was Apple serial and I didn't want to daisychain that and one of these Keyspan or Belkin USB to serial adaptors.) I had to give my credit card number for that pre sales inquiry! (At least they didn't charge it.) Then I still didn't get an answer and neither did I get one about whether the drivers would be ported. Lame, lame, lame. Then I complained in writing and about 6 months later I actually received a phone call. Once they smelled however that I wasn't a multimillion dollar CEO they dropped any pretense of an effort - so 9 months on I haven't ever heard back from them.
Translation:
DO NOT BUY HP. They obviously don't want anyone to either.
Canon make a grand portable printer with (Mac OS X drivers and USB connector) that I'm going to get as soon as I get some cash.
Anyone want to pick up a cheap used HP portable printer?
;-)
Jens