I have long been convinced that although Microsoft go on about innovation being one of their main strengths, they actually release very little that is actually innovative. Most of their big sellers are based on other people's work, either bought or just plain copied. This is a nice summary of the true origins of a lot of their products - http://www.mcmillan.cx/innovation.html
An other list : http://www.vcnet.com/bms/departments/innovation.shtml