Oh and Quicktime now has screen recording built in - very handy.
I actually did a little tutorial on iweb for my sister using nothing more than my MacBook Pro & it's built in Mic & it worked great. Gives you the option to save it for web pages too or upload to You Tube.
Again by itself nothing spectacular, but another neat addition & it's a doddle to use.
Just remember to install Qucktime as it is no longer installed by default.