Regarding scientific PDFs--if you want to use a 6" device the Sony 650 is the way to go. It's certainly not a perfect solution, but the many viewing options--zoom, margin crop, landscape mode make it a pretty good compromise. In fact my husband has a 900 and he uses it to read a lot of technical PDFs. Now that he's seen my brand new 650, he wants one to replace his 900. His opinion is that with the improved clarity of the screen and the ability to lock the zoom the 650 would make a better reader for him. He might wait for the 900, but he's seriously thinking about the 650 because it is smaller and thus easier to carry.
dordale
