Excerpts from Loui Chang's message of Mo Jun 22 16:41:41 +0200 2009:
Is there a way for him to try the new 'dmraid' without going the whole way and migrating to [testing]. This would also be useful for him (and me) to know.
Pretty simple. Enable testing, install dmraid, disable testing. Then your testing is limited to those packages only.
While this works fine most of the time, when you run into problems and ask about it here or on the forums, the first thing that people tell you is: "you should either use [testing] all the way or not at all, since any particular package in [testing] might crucially depend in some other packages in [testing], and they don't get updated when you only update one particular package." Anyway, I still think it's a good idea to search the MLs and forums before asking for help here. Big chances are someone has already noticed/the change was announced in the dev ML.