Just thought this was rather interesting and wanted to share. This is a screenshot of just Askimet's ability to catch spam which is a long way from 99%. Installing AVH First Defense Against Spam and setting it up to compare commenter IP's versus known spammers was the only way I could get the spam back under control such that it didn't fill my queues.
Obviously 'something' happened in January, some started using chinese gold farmers or whatever their equivalent is for spamming or they came up with one frack of a good scripting bot system.
Either way, if you're being bombarded by spam and are running a wordpress site then make sure you've got the default Askimet set up and consider installing AVH and getting the API keys to enable the multiple databases it compares again.