Palm V - mostly short stories from fictionwise (I think it was called something else then)
Palm m515 - nice screen for the time but poor battery life
Palm Treo 270 - can't believe I read vols 1-3 of Decline and Fall of the Roman Empire on the tiny treo screen!
Palm T5 - a really good LCD screen, much less glare than my iPod touch, BlackBerrys or HTC phones
Sony PRS-505 - love it to bits