WordPress 2.9 was released yesterday and I thought it was worth reposting the introduction video done by the fabulous Michael Pick:
Note that the above video is embedded using the new embeds feature that I wrote. I just dropped the URL onto it’s own line and it was converted into an embed automatically! 
Please I need your help.
I updated my wordpress to 2.9.1 version, and I want to use this feature about embedded videos automatically, for do that I have to install your plugin?, or wordpress 2.9.1 do it for itself?
Because I tried to embed video in my post and didn’t work.
I used a plugin called Smart Youtube, but I think that this new feature is better so far.
I hope your answer thanks a lot
http://codex.wordpress.org/Embeds
I tried again, my new posts works nice the new feature, but with my old posts, I don’t know why it’s impossible embed videos directly with the link , please help me, I want to show my videos in all my posts (olds and news)
It’s because the links were witch center align, so I don’t know now how can I embed videos in center align, but anyway the feature works
Wrap your URL in the [embed] tag, as described at that URL.