Akismet

There have been some big spikes in spam lately, and yesterday was the first day we processed more than 3 million comments. The spam has been coming in hard and fast, according to Six Apart’s status blog it was even the cause of Typepad downtime this morning.
Load-wise we’ve been fine, but there has been [...]

Soaked and Soaped has written a nice tutorial on using Akismet with any Rails application.