Current Olympus dSLRs do have the 'live preview'... apparently no one noticed that, guess someone should send their marketing department a note.
It wasn't that long ago that composing on an LCD screen was a new thing... but I guess it's like having mobile (cell) phones - people can't remember what life was like before. If I was using a compact I would definitely use the screen over the crappy little viewfinders, and I like being able to use it at waist level as I can with a TLR, but yeah I'm happy enough with the viewfinder on my dSLR... though I'd be a lot happier if it could be as big and bright as the ones on older film SLRs (btw shingfan it wasn't always hard to tell with the viewfinder on film SLRs, not before they introduced autofocus and decided we didn't need to know if it was in focus and should place our faith in the camera... while autofocus can focus better or faster, it doesn't mean it always does!)
It wasn't that long ago that composing on an LCD screen was a new thing... but I guess it's like having mobile (cell) phones - people can't remember what life was like before. If I was using a compact I would definitely use the screen over the crappy little viewfinders, and I like being able to use it at waist level as I can with a TLR, but yeah I'm happy enough with the viewfinder on my dSLR... though I'd be a lot happier if it could be as big and bright as the ones on older film SLRs (btw shingfan it wasn't always hard to tell with the viewfinder on film SLRs, not before they introduced autofocus and decided we didn't need to know if it was in focus and should place our faith in the camera... while autofocus can focus better or faster, it doesn't mean it always does!)