"There are no pages in our index for "blahblah.com"* * We cannot perform SiteSearch on this domain(s). Please remove/change the domain(s)entered, or select WebSearch only, by leaving the domain(s) field blank."
I'm getting the same results with just about every web site I maintain. Individual pages for all the domain names I tried definitely show up in a normal Google search. They are crawled by Google each month and many have respectable PageRanks.
Thank you for your note. We're aware that webmasters are unable to register for Customizable Google Free WebSearch. We apologize for the inconvenience this is causing and assure you that we're working to resolve this problem. Please check in again soon.