Here are some of the things you can do to ensure a site or domain hasn't been previously suspended from AdSense: http://www.jensense.com/archives/2006/03/safeguarding_yo.html
wow, yeah, that does seem like a bit of work. but it's wort it to know if the domain is blocked or not.
best and sure way is to write to google and ask them - seriously... that's what i did and got a canned response from them... i replied to the canned response and someone actually fixed my problems for me (i was only receiving psa ads)...