The different versions of Debian has codenames taken from the computer animated movie ToyStory. At the present the following versions are widely used:

What to use

To choose which release might suit your requirements best read http://people.debian.org/~osamu/newbie.html#best [http://lists.debian.org/debian-devel/2003/debian-devel-200301/msg01753.html addendum]

Point releases

There are also point releases, which are updates to the stable releases. For the most part, these just add security updates. Debian 2.2r7 was released on July 13th 2002.

Older releases include

(Did I forgot a version - add it. If you know some highlights of the versions please add.)