I'm getting hit with 1000s of comment spam, but I figured out an even faster way to delete them all in Wordpress. Go to Edit>comments. Do a search for whatever word is in them ("gambling"), the click "mass edit mode", scroll down, click "Select all checkboxes" (this might take a few seconds), then click delete all checked. Rock. All basic Wordpress install, no plugins needed, and you can delete 1000s of spams in a few seconds like this.
# Dec 1, 2004