Applications and installers should not require admin privilege

Recently, I have seen new class of applications which make more sense - these applications can be installed and used by a standard user without UAC pop-up. Some of these applications are:

Amazon Kindle for PC - installs in "C:\Users\user1\AppData\Local\Amazon\Kindle For PC\application"
Google Chrome - installs in "C:\Users\user1\AppData\Local\Google\Chrome\Application"
Microsoft Live Mesh - installs in "C:\Users\user1\AppData\Local\Microsoft\Live Mesh"

Any standard user on Windows 7 (and I suppose on Windows Vista and Windows XP too) can install these applications and use them. The installer does not ask for admin password (no UAC pop up). And the application runs smoothly without and UAC pop-up.

Other apps which come to my mind in this category are PortableApps.com apps.

There is no reason why other applications should require admin password unless they are installing a device driver.