The latest version of the Anti-Kibitzer Script (click "View the original post" above this comment to lean more about it)

• is integrated directly within LessWrong (no more Greasemonkey)
• is controlled by a section in the user Preferences called Kibitz Options
• hides names and scores from sidebars, and hides your own karma score

To activate, simply navigate to Preferences and check "Enable anti-kibitzer" - this will add a button to the upper right allowing you (without refreshing the page) to temporarily display names and scores again.