I went on a tour of the Harry Ransom center during SWALL 2006; it was fascinating.
New Yorker article on the Harry Ransom Humanities Research Center at the University of Texas and how the literary archive has grown to over 36 million manuscript pages, 5 mission photos, a million, books, etc., etc. The article is eight pages printed out, and well worth the read.
It does bring up the question of what will be in literary collections of the future. Printouts of blogs? Entire web sites saved? Wikis of different versions of materials? Printouts of emails? Interesting food for thought.