Not sure if this is the correct place to mention this or whether it's been reported before (I couldn't see anything) but the Playground search isn't currently working.
It just redirects to a google search, which is fine, but it's redirecting to 'site:Arduino Playground - HomePage' rather than 'site:http://playground.arduino.cc' meaning that you get no search results. Seems like a simple fix for whoever has the access to do this.