Last week saw the digital launch of Jeff Kinney's comics/prose hybrid Diary of a Wimpy Kid, which can now be purchased from comiXology, either through its regular service or through its dedicated Wimpy Kid app, Kindle, Nook, or iBooks. The seventh volume, The Third Wheel, which is due out on Nov. 13, will be available digitally the same day as print. Abrams has created a special brand, Wimp-E-books, with its own logo, for the wildly popular series.
(Interestingly enough, the initial press release from Abrams, dated Oct. 15, didn't mention any platforms, which seems like a grievous omission.)
You can still get the original edition of the book for free on the site where it first appeared, FunBrain.com. That's where Kinney first published it, and it's interesting to compare this first edition to the published versions — I took a look at the first few pages and the edits were obvious, and generally improvements over the original. It's still pretty good though, and years ago, when I showed it to my daughter, who was maybe ten at the time and a bit of a reluctant reader, she took my computer away and read the whole thing in one sitting.