Most anti-comment-spambot-plugins focus on user interaction, e.g. captcha or math comment spam protection. Yawasp focuses on handling comment-spam-protection within WordPress. It replaces the names of the comment form fields with random names, protecting your blog from spambots that aim at the default comment field names. Furthermore it adds a blank field, hidden from the user, that needs to be left empty. In addition, the random field names are changed every 24 hours, giving a spambot no chance to adapt to the comment form.
Now the user must no longer fill out any additional fields in the comment form, and you can focus on blogging and your readers comments.
Let me know, what you think.