www.rentyourdot.com
Not only does it monitize your 404 traffic, it actually generates traffic!
Here are my statistics for my domains.
Note: "Total All Time Visitors 11,487,701" This is from 404 traffic that was 0 visitors per day about before I signed up, which is now at 11 million visitors and counting.
Quickstats for September 18, 2008
Todays Visitors 1,456
Yesterdays Visitors 1,588
7 Day Average 1,508.6 Visitors
35 Day Average 1,431.2 Visitors
Total Visitors This Month 26,597
Total Visitors Last Month 42,547
Total All Time Visitors 11,487,701
Report by Domain
Host Sep '08 Aug '08
www.articlesrfree.com 1,800 117
www.strikeofgenius.net 1,287 1,305
www.feedginger.com 845 627
www.smartasthedevil.com 706 2,426
www.px8.org 682 1,110
www.ilogie.net 557 766
www.windowstan.com 494 784
www.muzna.net 448 557
www.infojerk.com 374 829
www.wazira.com 357 643
www.virtudeath.com 354 8
www.agentpedia.com 339 417
www.wildjohn.com 331 520
www.linkedre.com 329 752
www.adlinkre.com 314 267
www.divedeepblacksheep.com 305 184
www.lottoboom.com 299 327
www.strikeofgenius.com 284 604
www.faswe.com 283 176
www.reddoorrentalproperty.net 281 255
www.deadstroke.net 266 326
www.virtublue.com 260 45
www.sesam24.com 260 408
www.sofja.net 260 323
www.virtucode.com 258 324
www.britneyspearsgalaxy.com 249 33
www.00964.net 231 292
www.hajyehia.net 218 283
www.foxtoto.com 213 199
www.pamje.com 211 534
www.ologie.net 209 220
www.virtuquake.com 207 313
www.bastideblanche.fr 203 353
www.shortpayrealestate.com 203 257
www.00505.net 200 253
www.osfur.com 199 228
www.dukka.net 196 253
www.stupidpamela.com 191 159
www.israstan.com 189 284
www.mexicanmonkeys.com 187 212
www.wojud.com 184 276
www.wazma.com 178 339
www.hx6.org 173 271
www.hx5.org 173 129
www.virtualqueens.com 168 24
www.fatmp3.com 165 78
www.wallpaperwars.com 165 274
www.from.fr 160 358
www.photofight.com 156 280
www.lx6.org 153 186