We went to the Big Box Electronics Store in the next town over, and they had all four cameras of interest to me: The Canon 450D, the Nikon D60, the Olympus E-520 and the brand new Pentax K-m (!). My wife wanted to handle only the Canon, so that’s what we did. (Actually, I handled the K-m, but the four AA batteries were dead, so we could not turn it on. Apparently, they don’t know how to charge batteries at BBES).
We discovered something not-so-nice about the 450D: It does not focus intuitively in the Live View mode. That is, it does not focus when you press the shutter. Huh??!! Apparently, there is a special button on the back does the autofocus in Live View mode. The sales person at the store did not know that–we called B&H in New York (and spoke to someone in India, I think) to figure it out.
The X-m does not have Live View at all. Oops! It is a nice camera to hold–a bit smaller than the 450D, but a bit heavier. I wish I could have seen/heard the bells and whistles on it.
I have upload a picture of Yours Truly here, taken at BBES by my wife with the Canon 450D. Here it is (click on it to get the 6.5 MB, 12.2 MP version):

If you look at the JPEG meta data, you can see all the particulars of the exposure, camera, etc. It was zoomed all the way in to 55mm–the end of the range for the Kit Zoom on the 450D.
(I used GIMP to smudge out an unsightly stain on one of my teeth, which I did not know I had. See if you can figure out which tooth. The first one to guess it gets to use the camera a bit over Christmas, assuming that it is one of my regular blog readers–that is, one of my children.)
I haven’t made the purchase yet–soon, I think. With this new revelation about the Live View focusing, the Olympus is trying to creep back into consideration. (They say that the E-520 has the best Live View yet for a DSLR.) But my wife really wants the Canon, nonetheless, and says this focusing weirdness is not a deal-breaker.
I’ll keep you posted!