I believe it is called Akismet and it is made by the person who made Wordpress. You need a wordpress.com blog account to use it though, as you need to api you get with that account. Install the plugin though and it works great.
I just added it to my busiest blog and it has caught every piece of spam sent in the last week except for 1. The good thing is though it can learn when you tell it made a mistake.
Defiantely a great plug-in.
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