Hi,
A problem I find I have in Safari, Firefox and IE (urgh!) is that they can't play embedded video that requires Windows Media Player. I have the latest version installed, and when the object appears on the screen it does load Windows Media Player, however all the buttons are greyed out except 'stop', and it just shows a blank/black square where the video should be.
Any tips? QuickTime and Real Player work fine in this regard, however some sites use bloody WMV files.