Dear Guy Who Thinks His Username On YouTube is Tweek:
Your username is not Tweek. My username is Tweek. Please stop clicking on the “forgot my password” link and typing in my username. I don’t need an email reminding me of what my password is, I already know it.
And YouTube, you’re not blameless in all of this. Why not follow the lead of sites like Flickr, Myspace, and pretty much every other site out there and require a user to enter the email address he signed up with to get his password reminder?