Yeah, perhaps something like a domain report card highlighting any problems their system has currently flagged for it and linking to solutions. Would be useful even on domains you've owned for a long time, just to help determine if there are any concerns.

For example, when Google first started the Panda updates, I read that some sites were being targetted via paid link buys NOT purchased by the actual owner. Would be nice if there was a tool that let the owner find out that was what was happening to his site.