I recently found what I consider to be an invaluable website. It contains tons of links to Greek and Hebrew scans of various papryri, parchment, etc. It has links to textual analysis and critique.
For the serious researchers here this site will be a big help. Of course, they probably already have a link to it, but for those that don't here it is:
http://www-user.uni-bremen.de/~wie/bibel.html#pap
If anyone has other links that are similar let's share them.