Re: live view on a 450d - does anyone actually use it?
Happy new toy
I don't even know how to switch on live view on my 40D...tis a completely useless feature on a SLR as far I'm concerned as I have no use for it. The viewfinder does everything I've needed 
Using live view can increase the noise in your pics as the sensor gets noisier as it gets hotter. The sensor gets hotter as it's used and it's being used to capture the live view image.....that's bad karma in my book so if I was to use live view it would be as a last resort only if I really couldn't use the viewfinder.
Andrew
A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away. - Antoine de Saint-Exupéry