If you've been keeping up with Windows 7 news, you know one of the selling points is a less annoying UAC system—so the 7 Tutorials blog set out to illustrate what was actually changed.
The biggest change in Windows 7 is the new User Account Control "slider" setting, where you can choose your own balance between annoyance and security—but behind the scenes, Microsoft reduced the amount of actions that will prompt you. The 7 Tutorials blog ran down a list of common actions that triggered a UAC prompt in Windows Vista, but don't in Windows 7, concluding that:
...in Windows 7 you will not encounter UAC prompts in at least 11 of the scenarios where Windows Vista triggered one.
Windows 7 vs Windows Vista: The UAC Benchmark [7 Tutorials]