
It turns out that Google's Usenet archive is pretty useful for tracking the lifecycles of Internet fads.
August 25, 2004: At Nelson's request, the data has been updated to July 2004.
2000:
Aug: 0
Sep: 1
Oct: 0
Nov: 8
Dec: 26
2001:
Jan: 267
Feb: 3160
Mar: 7070
Apr: 3880
May: 2950
Jun: 2210
July: 1870
Aug: 1520
Sep: 1360
Oct: 1460
Nov: 1040
Dec: 1010
2002:
Jan: 964
Feb: 743
Mar: 990
Apr: 845
May: 599
Jun: 389
July: 585
Aug: 452
Sep: 422
Oct: 352
Nov: 270
Dec: 293
2003:
Jan: 249
Feb: 553
Mar: 367
Apr: 417
May: 165
Jun: 1390
July: 654
Aug: 706
Sep: 358
Oct: 221
Nov: 187
Dec: 169
2004:
Jan: 188
Feb: 223
Mar: 430
Apr: 298
May: 136
Jun: 110
July: 271

Waxy.org is the sandbox of 
9:01 AM
I was going to say that you could probably do something similar with daypop, although usenet is probably a slightly wider sample of net users as a whole. really, if you combined google groups, daypop, and were able to mine through hotmail, aol, and yahoo email traffic, you could probably track trends like this pretty exactly.
10:12 AM
The problem with Daypop is that it's not currently possible to track trends through time, since they don't list the date that a site was first mentioned on a weblog; only the date that the site was last cached.
Blogdex doesn't have that problem, though.
11:25 AM
HSX.com for memes?
11:34 AM
Hmm, not a bad idea. It'd be easy to track memes with a combination of Google/Usenet/Daypop, if you could narrow the meme to a single key phrase (e.g. "all your base") or a URL (e.g. http://www.hamsterdance.com/).
I'll be sure to start work on that in my copious free time.