Windows Live Program Manager, Imran Qureshi:

"Today I'd like to give you a sneak preview of one the most exciting features we have coming in our next beta refresh of Windows Live Mail (codename:Kahuna): Spell Check As You Type."
Windows Live Mail (codename:Kahuna) is the next version of Hotmail.
One thing interesting thing I heard in the video: 'roaming dictionaries'.
The team show some Ajaxian coolstuff, but I didn't actually hear the word 'Ajax'...