How does Windows 7 use RAM differently than earlier versions of Windows?

One of the more notable ways Windows 7 uses RAM differently is its applicatoin of Address Space Layout Randomization (ASLR). ASLR is a great security improvement to operating systems in which all data stored into RAM by a -supported- application is placed in random locations within the RAM bank. That way it is harder for viruses and malware of the sort to corrupt or otherwise compromise the data within the RAM. This feature may also be in Windows Vista, i don't remember. But there is more information on ASLR on wikipedia.