True Print-On-Demand
The current state of POD is a site like Lulu.com or Xlibris.com. You go to the site, find the book you like, have them print it and mail it to you. If you are willing to pay top dollar for the shipping, you can possibly have your book the next day. 24 hour turn around for a small extra fee.
How about 7 minutes? The "low cost" machine described here
can print, mill, glue and bind two books at a time in less than seven minutes. The Expresso is available next year from a company called On Demand Books. The New York Public Library is scheduled to get a machine in February. It is currently set up to print books no longer under copyright protection.
As these machines proliferate and the costs come down for both the machiens and the books it prints, could this spell the doom for POD sites? Seems to me in order to get that "browsing" feeling that they will need to add some sort of preview ability otherwise people will have to know what they want before they use the machine. Perhaps the web sites will end up more like photo printing web sites or an ATM where you upload your book and can have them print it and send it or go to the local bookstore to print it.
Don't forget to check out the videos at the second site.