I've seen a lot of messages on this forum suggesting that people turn off UAC, calling it "useless" and "annoying". While if that's really what you want to do, then so be it... but I believe most people that advocate this don't really understand the ramifications of what they're doing.
Disabling UAC doesn't simply make the dialog go away. It completely changes the way Vista and 7 operate. Important security features like Internet Explorer Protected Mode no longer function (this is a mode in which even if there is a vulnerability found in IE, no external program will be able alter your system).
Another feature that's disabled is called folder virtualization. This is what allows programs that assume they have administrative permissions to write to protected areas (like Program Files) to continue to function. If you turn off UAC you will find a LOT more problems with older software compatibility.
Finally, turning off UAC rips the wings off angels, endangers kittens, and creates an unhealthy work environment for your puppies.
Learn to live with UAC. Once your system is setup, you will almost never see it (especially on 7). You will be safer, your system will have fewer problems, and you'll learn to love the atomic bomb.
And please, for the love your dear and fluffy lord, do NOT tell people to disable UAC if you really don't fully understand what doing that does.