According to Ars Technica, the first crack for Vista and Office 2007 has surfaced.
Unlike a normal crack, however, this one just replaces some of the key Windows and Office files (presumably the activation and ‘revenue protection’ DLLs) with their contemporaries from the earlier releases. That means you can use Beta or Release Candidate activation keys on the final release and use the final versions.
Unfortunately the article doesn’t mention whether the cracked versions have the expiry date that the pre-release versions had (software with an expiry date? Now that sucks).
No doubt they’ll just block the beta keys very soon via Windows Update or Windows Genuine-we’re-going-to-make-you-run-some-stupid-software Validation.