Defender

I'm hoping it keeps the same cool old school sound effects from Williams. Oh wait, wrong Defender. I'm still waiting for Windows Robotron:2084.

Actually, I loved the original Robotron to death. I almost bought a standup version of it a few years ago.

But, back on topic, one of the good things they are working on for the definition updates, is to use the same BITS technology that is used in Windows Update. I think that's a really good idea. I've seen so many various versions of 're-inventing the wheel' on various parts of Windows that it is refreshing to see a little bit of code reuse from time to time.

I still don't agree with them marking Gator as 'acceptable' in the original MS AntiSpyware though.

MS AntiSpyware is a Terminal Server killer, since it launches 3 processes per user session. That's just a bad idea on a fully loaded server.
I'm hoping it will just be a few threads and maybe a couple standalone executables.