UpdateSPY by 'Zouzzz' is a nice Windows tool that allows you to easily download almost all Xbox 360 Retail System Updates, since 2.0.6690.0 up to the latest 16197 Dashboard.
Here's the changelog for the newest release:
v16197-1:
- Added update 2.0.16197.0 download
- Added update 2.0.16197.0 detection
http://team-xecuter.com/updatespy-v1...now-available/
