Captcha plugin

I am thinking to remove captcha plugin from my comments form.

It prevents people using non-visual web browsers to comment. And, it is annoying for others (at least I know, I dont like them)

But, this plugin (together with 2 more) is helping me to filter all the spam. I usually have about 100-150 spam comments a day!

Do you have better solution for comment spam?
If it can be easy integrated into serendipity it would be great.

thanks

EDIT:
maybe something like that: http://paulgraham.com/spam.html

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