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So, Gatekeeper?

It won't send you any emails, but it will prevent rogue software from being installed.

You can set the security preferences in OS X to only allow installation of Mac App Store applications. That minimizes risk greatly.

http://support.apple.com/kb/ht5290

Only about 20% of the apps I use I've ever downloaded on Mac app store. But I imagine for some non-tech savvy users this could work.

I would definitely pay for something like this. The ability to approve installs remotely would be amazing.

That's a really good idea. Maybe hacking it into the OS like that is going a bit far, but automating the "hey, does this look ok to you?" process is definitely a goer IMO.

It would be nice if OSX's security model was extended to require the root password for any application or plugin installer that isn't handled directly within a process.