www.johndiesattheend.com
No popups or stupid crap like that, its just a REAAAALLY long story. Gets interesting around chapter 3, and just awesome near 4 and 5. You will defecate yourselves in horror.
"...like being run over by a truck made of horror, hauling four tons of stupid..."
Oh, and his original site, www.pointlesswasteoftime.com is pretty awesome too.
I love the PWoT Suicide Notes.