If you attended a VS2008 InstallFest in the last couple months and registered your trial copy of VS2008, you have probably received the final media in the mail in the last day or two (or probably will in the next day or two). Someone sent me a note today asking about activated the installed trial version with the "real" software key. He (and I) thought that it would be done from within the VS2008 IDE.
We were wrong. In case anyone else is missing it like we were, this tip is for you. You have to actually run the installer on the new disc. Choose the option to "modify or uninstall" and after the installer finally loads, click next and you’ll see a handful of choices, including one to add a license key. Copy the key from the disc jacket and you’re all set.