Center:
[center*][/center*]
Example:
Hello, I'm centered lolz
Spoiler:
[spoiler*][/spoiler*]
Example:
YouTube:
[youtube*][/youtube*]
[youtube]http://www.youtube.com/watch?v=PJUGgM8OTWE[/youtube]
If there were any other BBcodes that I missed, please report them here.