Well the newer spam bots can bypass email and image verification... need new methods! Check my profile for a decent anti-spam hack (similar to Psionic Vision's suggestion). It has been catching 100% of spam for me on a few sites, as well as many of my friends' sites.
Another good one is the NoSpam! image verification one. You may want to also look into blocking common (spam) email providers. I would never block yahoo/msn/gmail because a HUGE chunk of people use them.
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