Our distro is based on "Wheezy" but comes with hardware SPI, I2C, one wire, and WiFi support for our wifi adapters. It also has some things to make overall hacking easier such sshd on startup (with key generation on first boot) and Bonjour (so you can simply ssh raspberrypi.local from any computer on the local network)
Like any tweaked distro, this distribution is not designed for beginners! We designed this specifically for what we think hardware hackers want, and may not suit your needs. Please check out raspberrypi.org/downloads for official distributions.