I want to ask them few questions. but I couldn't find contact form on help page - just forum and blog :S
They will only answer if the problem is critical and is associated to you only. Better use the adsense google group. You will get solution of your questions much faster from various members and may be from adsense team also. By the way their support email is adsense-support@google.com, but don't mail them if you don't have any serious question. Use google groups. http://groups.google.com/group/adsense-help
I don't advice you contact them by email, they will just forward you automatic replays. Use this url https://www.google.com/adsense/support/bin/request.py