It took a little longer (got to get through the Canadian border, eh ja?), but The Shape of the Universe is now available on Kobo here:
http://www.kobobooks.com/ebook/The-Shape-of-the-Universe/book-9ldgcPdzjEeWTkg5hGw2nA/page1.html?s=gEUiob9koEiFEcrTxOZqQg&r=2

Kobo uses the EPUB format which Wikipedia says “The EPUB format has gained some popularity as a vendor-independent XML-based e-book format. The format can be read by the Kobo eReader, Blackberry Playbook, Apple’s iBooks app running on iOS devices such as the iPhone, iPod Touch and iPad, Barnes and Noble Nook, Sony Reader, BeBook, Bookeen Cybook Gen3 (with firmware v. 2 and up), COOL-ER, Adobe Digital Editions, Lexcycle Stanza, BookGlutton, AZARDI, FBReader, Aldiko, Moon+ Reader and WordPlayer on Android, the Mozilla Firefox add-on EPUBReader, and Okular. Several other desktop reader software programs are currently implementing support for the format, such as dotReader, Mobipocket, uBook.”

Read the whole post of e-book formats at http://en.wikipedia.org/wiki/Comparison_of_e-book_formats

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