I was asked via email about exactly how many comics have been scanned thus far (which is really such a hard question to answer because people scan the NEDOR comics for gosh sakes, so when you ask that question, I'm at a lost for a frame of reference...)
Anyway, I'm going to attempt to answer at least *part* of the question by posting the latest version of What's Scanned and Unscanned in the DC Universe - consider this a partial answer...feel free to examine the linked file and come back here for discussion...you can navigate the page by clicking along the tabs at the bottom.
NOTE: I did not create this list. It is maintained by someone called the Phantom Stranger who does a remarkable job keeping up with all the new scans!
One of the first things you'll notice is that there are apparently only 3002 DC comics left to scan, and then ALL of DC publish content will have been scanned! Pretty amazing when you consider how long DC has been around.
I believe that the scanners are doing a good thing btw, as I doubt DC will ever get around to reprinting Binky, Bob Hope, ect...I'm glad someone is preserving those comics in some fashion.
A lot of the Unscanned stuff are Romance comics - not surprising as there lot a lot of sentimental attachment to those titles for the majority of the scanners.
If you click on the Scanned tab, be prepared to wait as that page loads - its a 15 meg html document... :P