Heh yeah, Resource Moitor.
Vista had this too but it's on steroids in Windows 7. Wanna find out what's hammering you hard drive? Look at the the Disk tab. And under the CPU tab it shows every DLL thread and handle for every process. THe Network tab shows you all the info you used to have to shell out to ipconfig and netstat for, all live!
It's stuff lke this that is ALL OVER in Vista and with more polish in Windows 7 that makes this OS completely kick XPs butt. But sadly most people will never see how much it's improved "technically", they'll see three UAC popups and their 12 year old printer wont work and it'll be called "Junk" all over again