Having owned the original Pilot from USR and a Palm Pilot V, I must say I ditched the V only when Palm refused to update a proper Mac client, thus abandoning a large (en)gadget loving user base.

Then, when they started to embrace Windows Mobile, I knew it would only be downhill from then on. Nothing good ever came out of a collaboration with Microsoft, except for MS ofcourse.

I thought the screen of the Irex iLiad (http://www.irextechnologies.com/) was smallish, standing at A5 (half US Letter for non-conformist folks out there). This Sony screen looks even smaller. How can you comfortably read an A4 sized PDF on that? Even on the iLiad I have to remove the margins of other people's PDF files to make them readable on the iLiad.
Many, many PDFs are still formatted to be printed out, so are in the A4/US Letter size. A nuisance, until screen resolutions step up.

From what I've heard from one of the iliad developers, they are definitely going to publish an SDK for it.

I've seen & held the irex iliad. It's great. I agree it's a steep price, and I'm still contemplating of buying one but, do not forget:
it contains 512 MB. ALL your O'Reilly books will fit on it, a lot of reference PDFs and more. It's actually more convenient than a pocketbook, since it stays flat and it's a lot lighter than most books I have. Couple that with a battery that last for at least a week (I hope mucho longer if you don't use the wifi option too much), and you can fit a 50 kg library in a 390 g package.
Oh, and readability in full sunlight is excellent. Now for the waterproof version and you can use it to read books on the beach.

Apart from the colour and the omission of a firewire port, this looks almost exactly like the LaCie Pocketdrive of three years ago. As a plus the old one also had slots to store the cable. Nothing new here, move along.
http://images.google.com/images?q=lacie+pocketdrive&svnum=10&hl=en&lr=&c2coff=1&start=20&sa=N
Apart from the colour and the omission of a firewire port, this looks almost exactly like the LaCie Pocketdrive of three years ago. As a plus the old one also had slots to store the cable. Nothing new here, move along.
http://images.google.com/images?q=lacie+pocketdrive&svnum=10&hl=en&lr=&c2coff=1&start=20&sa=N