This blog is defunct! Check out my new music blog at Sonicrampage.org.
Yesterday, at Boing Boing I found a link to a gallery of old school hip-hop flyers. There's some totally cool stuff to be seen there (like the one I've linked to above), although I must warn you that it's all on one page, and it takes a while to load even on broadband, so don't bother if you are dial-up.
Another cool resource for old flyers can be seen at Everything Starts With An E, a site dedicated to the original UK rave scene, that has a massive selection of flyers from 1988-1993 for British raves.