The olympus is a good camera from what I have seen, Olympus has always had good SLRs, even pre-digital as in the OM cameras. That being said what made the OMs great and the e-volts good is the Zuiko lens. There's a handful to choose from, so while there is not the sheer volume of lenses available such as in the case of the Nikons or Canons.
The one opinion i differ on is to buy it as a first step. I've always believed the important part of a camera is not the body but rather the lens. If you're going to buy into a system, get good lenses, and skip the "kits" in most cases. Nikon has already shown how quickly they are progressing in body development - and as your skills progress new bodies will certainly become available.
There is this rush to adopt high megapixels. IMO, this only compensates for lack of investment in quality lenses. SUre, you can crop and modify pictures from a 10 MP camera, but if your lenses are good (adequate range for your subject and overall light transmission) and you work on composition of photos, cropping is rarely needed.
REM1100 makes some very good points - i just wouldnt recommend buying one camera to use for a couple years and then give up on that investment to go for a different body. PIck a system, stick with it and build your kit up. If thats Olympus, cool, Canon or NIkon is fine too. Shoot what you like.