More and more I'm finding that it's good to read books on my PDA. My PDA is also my phone, so it doesn't tend to leave my side. It has wireless too, which means that it syncs really easily when I'm at work, or some other hotspot. So it's great for downloading RSS feeds, podcasts, that type of thing. I have a 1GB SD Card in it, so storage isn't a problem. Nowadays when I'm by myself in the car, I'm listening to podcasts instead of the radio, and at other times, I can check out media-casts that have downloaded, or read some PDF that I have.
Recently when I had registered to do a couple of exams at TechEd, I bought a couple of exam prep books, and was pleased to see they had PDF versions on an accompanying CD. So I put them on my PDA, and found that it was really handy. Certainly better than lugging around a massive great text book with me. So next time I want to get a book (maybe Jesper's book on security) - I'll be hunting around for a way to get hold of a PDF of it.
Dr Neil was telling me that there's a publisher who creates personalised PDFs for you when you buy a book through them. It puts your name in the PDF, so that they can tell if you make it available to other people. I think this is a neat idea. It makes the publishing costs really small. Shipping becomes free. And yet there is still no real worry about the publisher being ripped off by having the electronic version file-shared around the world. Now, if only I could get a bunch of non-technical books too...
Oh yeah - my phone is the O2 XDA IIs, for anyone that's interested. It's a good phone, although I would've traded it for the IIi if it had've been available at the time. The IIi basically trades the built-in keyboard for a better camera. I don't use the keyboard, so it's probably a trade I would've made.