Yep, thats about it. Several popular program written by people outside of Microsoft(which is why theyre called ‘third-party’) are failing to use the new security features in Windows 7.
Data Execution Prevention and Address Space Layout Randomization were introduced in Windows XP SP2 and Windows vista respectively, but have not been the easiest things to include in a third party program until the release of Windows 7.
Microsoft has made it easier to include these security features in programs designed to run on Windows 7, but only programs made by Google (Chrome and Picasa) are taking advantage of them.
You can read the article about this here.