This is probably one of the biggest questions I get from WordPress clients, and to be honest, I’m learning about new anti-spam plugins constantly because there are so many out there.
Everyone knows about Akismet, and it does seem to be relatively effective. However, many people I talk with don’t enjoy its reliance on API keys, or think it is not necessary, etc for various reasons.
In terms of performance and simplicity, though, what method(s) are you guys using?
CloudFlare claims to learn from WordPress “spam” databases but I haven’t noticed it being effective without various anti-spam plugins also being installed…