It was only a matter of time. The direct link to download the Android 2.2 "Froyo" update from Google's servers has been found. According to XDA-Developers, it only works if you have a "non-rooted stock ERE27 system" Nexus One. Meet the requirements? Can't wait any longer? Download link below.
Update: Want no pre-conditions? Here's another link, albeit less official so proceed at your own risk. [Thanks, Justin!]