If you're planning on using wmv files for embeded video, there's a bug in WMP 10 that makes the embeds take forever to download

Videos that take seconds to start with wmp 9 take forever if you have wmp 10 installed

Haven't seen any other reports about it, but we found it this weekend and tested downloads on several machines from several high speed access points

All the slow download points had wmp 10 installed

So if you used embeded wmv it's a heads up