WordPress 3.1 takes the longstanding complexity of adding videos and makes it much worse.
Q. What is the accepted means of adding a video to a site, Internet-wide?
A. By adding the embed code
Q. What is "Visual" mode editing supposed to do?
A1? - Delete good, proper code placed into "HTML" mode?
A2? - Hide the space used by videos -- or any hint they exist?
A3? - Allow one something close to WYSIWYG adding and editing, while allowing editor to move freely between it and HTML mode?
It seems that WordPress developers think A1 and A2 are the right answers.