I can speak from Canon's perspective. Canon's Rebel T1i includes Live View, as well. Actually, all of Canon's DSLRs in the past 2 years have included Live View.
I only use Live View on very rare occasions, such as when I have to lift my camera up in the air above a crowd to take a picture, or if my camera is on a tripod pointed straight up at the moon. Otherwise, for every other situation, I find it much faster to use the viewfinder.
Regarding lenses, zackiedawg's right in that the advantage of Sony DSLRs is that "image stabilization" is built-in in the camera itself, not in the lenses. So essentially, ALL your Sony / Minolta lenses will have image stabilization.
When you look through the viewfinder of a Sony DSLR, however, you
won't see the image stabilization at work until after the picture is taken! So you can hold your camera as steady as possible, but through the viewfinder, the image will still appear shaky. However, image stabilization is working behind the scenes in your camera body, so that your final image will actually be stabilized. In the end, it seems like a guessing game as you hope that the shaky image on your viewfinder ends up being an image-stabilized picture in the end.
On the other hand, Canon & Nikon's image stabilization are built into the lenses themselves, which makes them more expensive to their equivalent Sony counterparts. Because image stabilization is built into the lenses, you'll actually
see the image being stabilized as you look through the viewfinder. As you click the shutter button, you'll
know that the image-stabilized view you see in your viewfinder will actually be an image-stabilized picture in the end.
In the end, though, I believe I read that all image stabilization mechanisms are about equally effective, so one system isn't necessarily "better" than another. Hope that helps to confuse things a little more.
