Many of those who use WP know about the All In One SEO plug in that helps you optimize your blog entry for the Search Engines.
The original designer, creator of this plug in has stopped upgrading the plug in, though it has been passed onto another group/guy to maintain. Nice, but there is a new Plug In that maybe does a bit more.
It sets the No Follow / No Index meta tags for you, by your choice. It can give you a bit more flexibility than the All In One does. It is called Platinum SEO.
I have been testing it out, and I rather like it. Haven’t totally dropped the other one, and if you want to make the switch, it does import your old All In One information so you don’t lose on that score.
Latest All In One SEO HERE