kindle is great for ebook reading but the PDF convertion is pretty poor for specially formatted books (most rpg books)
i'm typing this on an acer one 8.9" mini notebook. windows xp for the o/s and it is a great pdf reader. probably better then my 22" lcd as the size seems more natural. runs about $350 or so on amazon.
nokia also has a net device that is very compact and linux based... its a web tablet of sorts, it is a decent pdf reader, pages are very readable even with the small screen, but each page seems to take forever to load.