Have a look at this article on the EP1 / EP2 :
the quote that struck me the most:
"In 2005 (see Cameras: the Next Ten Years) I predicted that electronic-viewfinder (EVF) cameras of type  will replace most of SLRs on the market, outside high-end and niche applications (think: medium format), within ten years. This will probably happen: we are seeing the first steps. Just wait until 2015."
Olympus is clearly on an innovative path. If memory serves Oly took a significant hit back in the days of film cameras after failing to adopt an autofocus system for the OM series. Surely they are not making this mistake again. Unlike other major manufacturers Olympus is innovating as opposed to "leveraging" aka recycling APS film era mechanical designs into current products. Oly also introduced newly designed lenses to match the 4:3 standard which were designed from the ground up while other manufactures again recycled the mechanical designs from the 35mm film days. The resulting Olympus lens quality is apparant from their consumer to the pro lines .. who else has an f2 zoom??
Other key advantages of the EVF cameras is the use of a true focal plane shutter which differentiates the EP1 / EP2 sytem from the DSLRs and offering significantly more versatility for flash photography. The other advantage is the short back focus distance in the EVF design which enhances the wide angle capability.
if anyone hasnt guessed by now I am a bit biased .. appologies to any offended.