Dear Shabbir, that's a good list. But I must advice not to use Akismet for preventing comment spam. Because it has some bad algorithm and sends many genuine comments to spam box. My and others best choice is "Growmap Anti Spambot Plugin" which will just add a javascript check box with comment form. Commenters will need to mark it to comment. "So called Bots" will not able to see it! Isn't better than captcha code or eater akismet?