I have installed the Automatically embeds video clips MOD. this MOD Automatically embeds video clips from links for 50+ sites including YouTube/DailyMotion/MetaCafe/GoogleVideo without the need for html or bbcode. Just copy the url from your address bar into a post and let the mod will do the rest. Its the ultimate user friendly way of posting clips and safe from a security standpoint.
http://custom.simplemachines.org/mods/index.php?mod=977
http://youtube.com/watch?v=vlwG-oVrxSY