If you read ebooks, and you haven't yet read The Atrocity Archives, the first volume in the Laundry Files series by Charles Stross, then what are you waiting for?
For a buck-99 you can't go wrong, though I have to admit I'm prejudiced: I acquired and edited the original hardcover edition of The Atrocity Archives for Golden Gryphon Press back in 2003. [You can read my lengthy blog post on acquiring both The Atrocity Archives and The Jennifer Morgue, volume 2 in the Laundry Files series.]
Of course, if you are already a fan of the Laundry Files, but don't yet have this first volume in an ebook edition, now is your chance to snag a copy cheap.
But don't wait too long: I have no idea how long this ebook will remain priced at $1.99. But for now, the ebook is available from just about everywhere at $1.99. Here are the links:
Think of the Laundry Files as "Lovecraftian spy thrillers involving a secret history of the twentieth century, although they are not set in Lovecraft's universe," in which magic is a form of applied mathematics. Our hero in the stories is Bob Howard (not his real name, because to know one's true name....), a slashdot-reading, T-shirt wearing, computer geek who nearly destroyed the city of Wolverhampton by accident while developing a new graphics algorithm. Bob was then recruited (a term used loosely, as it was either "join us, or die") into the Laundry, Her Majesty's supersecret black intelligence agency.
 The Atrocity Archives on Wikipedia.
 Bob Howard has been the main protagonist through the first five Laundry Files novels; but that role changes in book six. See my next blog post....