I think OP is trying to say that 7 inch tablets are less than optimal for reading PDFs, not that the software isn't there.
I think I'd have to agree with OP on that one because for a month, I had to read a 2 column PDF on a 10 inch tablet and that strained my eyes to do. Would a one-column PDF have worked? Yeah, it would have, but I think just barely. I can't imagine reading a one-column PDF on a 7 inch tablet (I hate scrolling unless it's to change pages), much less a two-column one.
Have you tried RepliGo Reader? I bought it back in the day for my G1 and have been using it ever since. It's magic enough to be able to get CS papers to be mostly-readable on my phone (with their special "Reading View"), so I'd expect it to do well on a 7-inch tablet.
