Almost complete list of software MS bought / has stolen from other smaller companies :

http://www.vcnet.com/bms/departments/catalog/


List of Windows features added by MS only in order to put other companies out of business :

http://www.lamlaw.com/DOJvsMicrosoft/WrapAndFlow34.html

Other cool link : MS Innovations : accepted / rejected

http://www.vcnet.com/bms/departments/innovation.shtml