I don't know about USEFUL... but I visit both
Homestar Runner and ilovebacon every day. They're useful for providing amusement, though.

Edit: oops... I posted more than one...

__________________
I see your fantasy... you want to make it a reality

Are you in the mood to be subdued

You see these shackles
Baby I’m your slave
I’ll let you whip me if I misbehave

Tie me to the bedpost

I like it rough
cause I'd rather feel pain than nothing at all