The easiest way to run as non-admin
This is the really important one for your non-techie friends and relatives ...
http://blogs.msdn.com/aaron_margosis/archive/2004/06/17/158806.aspx
"RunAs" basic (and intermediate) topics
A whole lot of detail about how to use "RunAs" to run programs under a different account.
http://blogs.msdn.com/aaron_margosis/archive/2004/06/23/163229.aspx
RunAs with Explorer
How to get Windows Explorer to work with RunAs (and why you might want to).
http://blogs.msdn.com/aaron_margosis/archive/2004/07/07/175488.aspx
MakeMeAdmin -- temporary admin for your Limited User account
How to quickly and temporarily give your non-admin account administrator privileges, without having to log out.
http://blogs.msdn.com/aaron_margosis/archive/2004/07/24/193721.aspx
MakeMeAdmin follow-up
MakeMeAdmin script updates, and a security setting you should change
http://blogs.msdn.com/aaron_margosis/archive/2005/03/11/394244.aspx
PrivBar -- An IE/Explorer toolbar to show current privilege level
A toolbar for Explorer and Internet Explorer that shows you broadly at what privilege level that particular instance is running
http://blogs.msdn.com/aaron_margosis/archive/2004/07/24/195350.aspx
PrivBar Source Code (finally)
http://blogs.msdn.com/aaron_margosis/archive/2005/10/13/480901.aspx
The Return of PrivBar (x86 and x64)
http://blogs.msdn.com/aaron_margosis/archive/2008/08/15/the-return-of-privbar-x86-and-x64.aspx
Setting color for *all* CMD shells based on admin/elevation status
How to automatically set the color and title of *all* CMD shells based on admin/elevation status with a one-time, one-line configuration change to your system.
http://blogs.msdn.com/aaron_margosis/archive/2007/02/22/setting-color-for-all-cmd-shells-based-on-admin-elevation-status.aspx
Follow-up Post, including coverage of PowerShell:
http://blogs.msdn.com/aaron_margosis/archive/2007/06/27/follow-up-on-setting-color-for-all-cmd-shells-based-on-admin-elevation-status.aspx
Running restricted -- What does the "protect my computer" option mean?
What does it mean to "Run as current user" with the option to "Protect my computer and data from unauthorized program activity"?
http://blogs.msdn.com/aaron_margosis/archive/2004/09/10/227727.aspx
Ctrl-C doesn't work in RUNAS or MakeMeAdmin command shells
http://blogs.msdn.com/aaron_margosis/archive/2005/02/09/370266.aspx