Posts with youtube links don't render well e.g. http://forum.arduino.cc/index.php?topic=192018.0
The youtube box is huge and pushes text down so that's appearing overlying text in subsequent replies - quite unreadable
iMac OS X 10.8.5 Safari Version 6.0.5 (8536.30.1)
Update: Under windows 7, IE 9 and Chrome V26 render the youtube box as a very short one.