I still only have Palms (Zire and Treo 650) or iPod (a 5G), so I'm not sure how useful my input will be. If there's a choice, I'd prefer RSS like now or via email. If some form of PDF, I'd appreciate it if it was Palm Adobe Reader-able.
Not sure what need you're trying to address that you don't already address here.
(Yes, I want an e-ink reader, but I'm waiting for 2G... and waiting...
)