Try the Good Reader app instead. I've been using it for a while and it's been excellent. It remembers your last place in every file, and lets you zoom in without using crispness. You can get files into it directly from your laptop via wi-fi (unlike with Papers, I think). The authors are also very responsive to email suggestions and comments; if you send them a PDF file that's hard to read for some reason, they'll sometimes convert it to a better form and send it back to you.
The app costs $5.