When Steel Sky was released it was a real buzz, particularly when it gained great reviews and sold well. The release of the book was a little better, but only because it's more personal. I created the whole thing, the content and the design of the book, so it's a bit of a landmark for me personally.
If games could be published using a similar model to the print-on-demand book publishing method, I think we'd se a larger range of professional quality games because the overheads would be vastly reduced. It would also mean that a game would never need to go "out of print". The retailer could order more copies as required and they would be duplicated and sent out.
Signing sessions? I haven't had any signing sessions. Yet.