if you can stand the interface, marvel has begun to digitize comics... although I'm too broke to subscribe at the moment, so I can't tell you what issues are available, and I've read a great deal of complaints about the program.
I do think though that it and TPBs will be the way comics will be published in the future.
I actually really like the idea of digitised comics, my problem is that I cant read them on a monitor. I wish they offered a subscription based service for the Kindle and the Sony e-reader.