Hi Lanzi,
I use c't-vdr (based on lenny), too. It works and that's okay for me. Aptosid may be a little bit "dangerous" for such a "mission critical task". Dangerous in case of describe my girlfriend that I (she) missed to record her favourite soap because of some d-u trouble. Never ignore the waf (womens acceptance factor) (:
My next vdr will be like this one based on squezze:
http://www.e-tobi.net/blog/category/ct-vdr. If you use c't VDR I think you can handle german language.
Feel free to do with your system whatever you want, but this forum is not the place to propagate Debian stable based solutions. People who are asking at Aptosid have a reason - they want Debian sid, and OT made that already clear. Add that the topic was already answered fully, no need to add a boring squeeze alternative.