Missing the Speed Tracer extension. http://code.google.com/webtoolkit/speedtracer/get-started.html

The so-called "AdBlock" extension for Chrome has no affiliation with "AdBlock Plus" for Firefox. Note also that Chrome extensions don't get to tell the browser what not to download – therefore all ads are downloaded then hidden, which is very different than the behavior with Firefox.

Check out 13 Top Google Chrome Extensions for Chrome Lovers at:
http://www.ideaflea.com/2009-12-15-13-top-google-chrome-extensions-for-chrome-lovers

[Removed HTML formatting – Tony]