Some special remark to (a) Rieselfeld and (b) Vauban. Rieselfeld is a good example for a post-modernistic, planned new quartier, the 90ies equivalent to the satellit towns of the 60ies and 70ies, only better. They have tried to introduce a good lot of urbanity into that Rieselfeld, to connect it to the tram system, to do some interesting and not-so-boring architecture, etc., etc. One isn't so sure if this works really, but time will tell.
Vauban on the other hand is an area once used by the French forces, now also build into a new quartier. There are some public action groups and student housing initiatives, and so suddenly it turned out that the lifestyle of the Vauban area is quite a bit more interesting as the lifestyle of the planned Rieselfeld area. What a pity, hmm?
For more information about how the town sees itself look at http://www.freiburg.de - that's the official page about it.