To get back to Point and Shoot cameras, they use CCD sensors. That means they have little rinky-dink CMOS sensors hidden away next to the CCD sensor, and they use those to let you compose on screen and record movies. But those tiny sensors have pathetic imaging capabilities, and understandably so. Point and shoot cameras are small and inexpensive. Manufacturers can't afford to cram expensive components in there. Not so in the E-510 and other DSLRs that have Live View or its equivalent. They use the same large, expensive sensor for everything. While they won't let you record movies, they will allow you to see very accurately what your camera sees, directly through the lens, and will automatically compensate for aperture, shutter speed, ISO, and white balance settings so you can see how a photo will look before you press the shutter button.
The camera also features Olympus' SSWF (Super Sonic Wave Filter) technology, which shakes dust off the sensor. Olympus was the first company to introduce this feature, and other DSLR manufacturers only recently introduced similar technology on their cameras. The SSWF light is located next to the shutter button on top of the camera, and it flashes blue when it's active. I can tell you that it does work. I did not have to sit there with the Heal tool, removing dust spots from the photos taken with my E-510, whereas I have to do that on a regular basis when I take photos with other DSLRs.
Another important feature built right into the camera is the sensor-shift image stabilization. It stabilizes the image by shifting the sensor on both the X and Y axis (horizontally and vertically). You can hear it working on longer exposures. It works pretty well. But don't forget to switch it off when you mount the camera on a tripod, otherwise you'll get blurry photos. This is a pretty common bug with image stabilization technologies, and it doesn't matter when they're built into the camera or the lenses. When the camera is kept very stable, they go nuts trying to stabilize what doesn't need to be stabilized. The end result is a blurry photo. So switch off the IS.