The first book I downloaded and read was a book called "Clapton's Guitar", which is about a guy named Wayne Henderson, who custom guitar builder that lives in Rugby WV (pop 20). The story is that he had never heard of Eric Clapton, but somehow Clapton stumbled on one of his guitars in a recording studio and insisted on having one. He eventually got one, but he had to wait several years, just like everyone else... It was a pretty fun read...
A also downloaded the primary Tolkien books (Hobbit + Trilogy), with the intention of re-reading them (it's been about 20 years). Just started on The Hobbit... I'll see if that motivates me to re-read the rest of them.
I'd also like to re-read the Shannara books (Terry Brooks), as I see there have been some new content added to the series.
I went looking for the Stephen R. Donaldson, Lord Fouls Bane/White Gold Wielder books, but haven't found digital versions yet. I also wanted to get a digital copy of Charlie and the Chocolate Factory and Charlie and the Great Glass Elevator (for nostalgia reasons).
I also downloaded a couple of Lance Armstrong's books, both technical (cycling specific) and motivational (Cancer survivor stuff), but haven't gotten around to read them yet.
Here is the page with info on the Orielly eBooks.
http://oreilly.com/ebooks/I've also been tempted to try reading some 'classics' from the google books cache, although I suspect those will just turn into insomnia cures. :p
http://books.google.com/