Olympus have done an interesting thing – a digital SLR where the LCD screen actually works when framing the shot.
(You mean they don’t all do that? Nope, not in digital SLRs – only the viewfinder works until you’ve taken the shot – the LCD screen on the back is only there for reviewing pictures after you’ve taken them. Making the screen work all the time isn’t as easy as you might think for a DSLR, or they’d all have done it long ago.)
The Olympus EVOLT E-330 includes an extra CCD sensor in the viewfinder mechanism, to feed the image to the rear screen at the same time as the viewfinder. It’s also possible to lock the mirror up, and have the rear screen read the data directly from the real CCD, but that gives you a couple of drawbacks – no autofocus, and around a second delay before it can take the shot. In this mode, it actually has to drop the mirror back down to do the metering, then pop it back up to take the shot. You do, however, get to see the real depth of field, and exactly 100% coverage of what will be in shot.
It sounds like an interesting camera, though I think if I was in the market for a DSLR myself, it would still be the Canon EOS 350D.