There are no end of crackpot sites on the Internet. If you don't think so, take a look at CrankDotNet for a good listing of the far-out (the biggest category is conspiracy). Once you have spent a few days looking at a sampling of crackpot sites, then you can take a look at some of the anti-crackpot sites. A good example is Operation Clambake which is an anti-Scientology site. You have to visit that site just to find out why Scientologists are so afraid of clams (click, click, click).
As John Dvorak points out, there don't seem to be that many crackpot blogs. I hasten to add: yet.
Dvorak notes: "The one odd thing I've noticed, though, is the relative lack of true crackpot blogs (and I don't mean Gnomegirl!). I know they are out there and the useful blogging software should invite true cranks and wackos like nothing before. Where is the abduction blog, for example? Or the time traveler blog?"
A possible exception is the blog-like Meta Tech which reports wacky news in a "for-real" setting --sort of like the National Equirer. If you want to find out if that tired feeling you've been experiencing lately is the result of reptiles mating with you while you sleep, take a quick look.
Speaking of really weird things, have you noticed that the Blogger spelling checker does not include blog, blogging or even blogger? Further, if you tell it to "learn" these words, it refuses? This is what (or reptiles mating with me) keeps me up at night.