Similar to the various other 'pay what you want' bundles but for ebooks. This version has some videogame history books. Quality of books can vary although there's usually a gem or two in there. The Atari one looks most interesting to me.
The books (last 3 require minimum payment of $12 to unlock):
How to Do Things With Videogames - Ian Bogost
"The year's best book on the subject of videogames." –The Austin Chronicle
Atari Inc.: Business Is Fun - Marty Goldberg and Curt Vendel
"It is an outstanding piece of work, and I’m thoroughly impressed. I am just so blown away by what you guys have accomplished that I don’t know what to say except THANK YOU, THANK YOU!" –Ted Dabney, co-founder of Atari Inc.
SCROLL: Collection 01-11 - Ray Barnholt
"Somehow Ray Barnholt keeps coming up with SCROLL issue themes that I totally didn’t know I was desperate to read about." –JC Fletcher, Tiny Cartridge
Service Games: The Rise and Fall of Sega - Sam Pettus
"…a must-read for any Sega fan." –A Little Bit on the Awesome Side
Ghosts in the Machine - Lana Polansky and Brendan Keogh
" It's not really what you're bound to expect, no matter who you are…" – Uninterpretative
The Gothic Tower & Assorted Interactive Fiction - Ryan Veeder
"Beautifully written, as was to be expected from Veeder, and not without its genuinely funny moments despite the emotional topic. Highly recommended!" –Colin Djukic
Boss Fight Books #1: EarthBound - Ken Baumann
"At last, EarthBound gets the paperback it deserves." –Kill Screen
Minecraft - Daniel Goldberg and Linus Larsson
"An incredible read that details the rise of Minecraft, Notch, and his amazing team. Interesting and intense, it’s a must for any gamer or fan of riveting non-fiction." –BookRiot
The Final Hours of Portal 2:Ebook and Steam Key - Geoff Keighley
"If you’re a Portal fan, buying it is basically a no-brainer. I am, and I highly recommend it." –Teleread