This is a well done collection of odd sites arranged by category. A couple of gems I found browsing today:
The Voluntary Human Extinction Movement (This is a good looking hoax site! See if your students are fooled.)
So you've decided to be Evil.
The Time Travel Fund (What a great idea. The logic is flawless.)
From the site:
Since the birth of the internet it has been a showcase for the bizarre and the strange. We can't help being drawn to weird and funny websites, and we at AlterVistas have undertaken the mammoth task of cataloging and recording for all eternity the weirder side of the web.
As AlterVistas' grows and develops we hope you will join us on our quest; a quest for truth, a quest for honor, a quest for what lies at the heart of every one of us, a quest for what makes us the best goddam species on the planet...a quest for oddness.