Secure your /wp-admin/ directory
Make an empty wp-content/plugins/index.html file
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I just did two of these on a WordPress blog I admin. Very easy to do and gives you a bit more piece of mind.

Read about how at:
http://…/three-tips-to-protect-your-wordpress-installation/

Check out these posts too:

  1. 10 Steps To Protect The Admin Area In WordPress
  2. Matt Cutts Translated: 8 SEO Tips I Heard Him Tell Eric Enge
  3. Video: Free SEO tips from Matt Cutts
  4. Veign’s Blog updated to WordPress 3.0
  5. Matt Cutts on using ALT tags
  6. What Should SEO's Focus in 2008 – Matt Cutts Answers
  7. Video: Google’s Matt Cutts On “Over Optimization”