saw it already in group policies but didn't risk giving it a shot so far. Saw it mentioned on the page linked by nmb about Win7 tips, and just found that article, sounds really interesting...what's your take guys?
Of course useless locally if you're the only user on your computer, but the rumor tells it can also protect from unauthorized ways, like network attacks...
http://4sysops.com/archives/review-windows-7-applocker-part-1-overview/(don't miss the second part of the article)
that was the bit in MS page:
5. Use AppLocker. We've been fans of Software Restriction Policies since Windows XP, and AppLocker finally makes application whitelisting possible. Use it to enhance or even replace your anti-virus software, ensuring that only the software you want to run will run.
...not sure I would trust that...anyway that sounds like HIPS oriented, although a HIPS has more sophisticated, or different ways...I must see more from that applocker thing before I can comment on it more seriously