Strange...
This is what I got on trying to open/validate your page:
500 Server closed connection without sending any data back
First, try to open your MySQL database via your hosting's control panel (phpMyAdmin?). Try to browse from there to your post with the google video - check if all is ok there. If needed, try to remove manually the embed html from the post...
More experience users may contribute more...
I know I once messed with the "where is your blog installed option" in WP/Options and restored things by editing one field in the MySQL where were the wrong settings stored. But I'll say it again - it depends.
Just try to open it and see how things with that post look from the "inside". Check FTP also, see if all files and folders are there, just in case - but I guess, they are there, just something else is wrong..
(
I also tried to see what happens if I want to open a certain admin page in WordPress - like:
http://www.cinemazement.com/blog/wp-admin/options.php
Well, after some time, Firefox asks "do you want to save this PHP file?". Hmmmmmmm... Very strange.
)
OK, that's for now what I can think about... Hope someone with more skills in that can contribute more:)