There is also Debian testing somewhere in between. And there is Debian
CUT ("Constantly Usable Testing), which essentially is a rolling release
consisting of Debian testing snapshots:
Unfortunately they have decided to pause that project until Debian
Wheezy is released.
I hope that a Debian sid based rolling release will be developed some
time in the near future within the Debian project. Maybe Debian CUU
(Constantly Usable Unstable) or CUS (Constantly Usable Sid).
But you can already get something very similar by installing Debian
stable, configuring sid repositories and upgrading frequently. But
expect to spend some time repairing something in the system every few
months - another reason to make backups.
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