Not sure I agree with his opinions, but a good article discussing the flaws of the revamped UAC in Win 7.
http://arstechnica.com/microsoft/news/2009/03/opinion-ms-should-kill-win7-uac.ars/2
http://arstechnica.com/microsoft/news/2009/03/opinion-ms-should-kill-win7-uac.ars/2
Either these actions are dangerous and should generate prompts, or they're not and they shouldn't. For Microsoft to say that they're only dangerous when other people's programs do them makes a nonsense of the whole situation.
It is worth noting that running Windows 7 as a standard user, using over-the-shoulder elevation, avoids all these flaws, as it lacks automatic elevation. However, the utility of this mode in typical home scenarios is not obvious. The first (and only) user created during the Windows 7 install process is an Administrator-level user. For typical users to benefit from over-the-shoulder mode they would have to create a second account and switch to using that as their default. This may very well be the best practice, but in the real world it is unlikely to be of any value in most home user contexts. After all, if using a regular user account had been standard practice among home users there would never have been any need for UAC (and especially Admin Approval mode) in the first place.