What is aptosid?
aptosid is an operating system based on the Debian GNU/Linux unstable branch, codenamed sid, and our ISOs hold fast to the core values and the Social Contract of Debian (DFSG).
We aim to be 100% compatible with debian sid, and we are at the forefront regarding the definition of a 'rolling' distribution.
Using aptosid, with Debian, will give you access to about 30,000 free and open source packages, be it for private, business or public use and will provide you with the cutting edge of the latest software currently available.
The project seems to be no longer developed. Last version, 2013-01, can be still downloaded from the official website.