Google has developed their book search functionality one step further and now provide magazines in the site at http://www.books.google.com. There is a wide variety of magazines featured including everything from science journals to lifestyle magazines. The choice is currently reasonably limited but Google are planning to increase the inventory considerably over the next few months, with back catalogues from a number of publishers.
The magazine functionality is quite fully featured allowing browsing of the magazine covers, selection of the magazine to read and then browsing of scanned pages, with options to read both single pages and in double page spread mode.
The functionality of magazine search really extends the book search and opens up a whole genre of published material to the search indexes. It could be very useful online resource when an extensive inventory of titles is in place.