Well, an update for me. I did it right this time. At work, I purchased 2 pdfs. Account was easy to set up, though the website was quite slow. At least all the images show up for me now. Anyway, I copied those pdfs to my thumb drive (using My Bookshelf in Adobe Reader). I brought them home, copied the files to my home computer, and they worked just fine. I printed one of the files at work (50 pages) with no problems. Assuming I can get these to my PowerBook just as easily, I'm a happy customer.
The DRM they use isn't bad at all. The docs are easily portable and printable. I haven't really seen much of a downside yet. A few more hoops to jump from, but nothing I can't handle. I have no problem trying to prevent piracy if it isn't too much of a hassle. This isn't.
Also, I think this poll is flawed. Of those who said No, how many don't buy PDFs anyway?