OLy's pixel mapping and auto sensor cleaning might be somethings youi find beneficial.

You can't go astray either way. I would say, though, that I think while Ronk's points are right, two other main advantages of the Olympus system are smaller sensors and hence smaller lenses and more depth of field - if that's what you like, and I have to think that most of the time you would, and live preview. In my view most writers have missed the point and ignored the advantages of waist level viewing when taking shots of people. It doesn't hide the camera but not having a camera in your face makes it a lot more natural. Every time I've wanted to get a serious rangefinder kit I remember this.
You will also have noted that there are significant price drops that I think are just about to take hold in a bigger way. Oly will have significantly more competitive specs in its prosumer model come Fall. The downside to waiting is that, I have learned from experience, it's not a great idea to buy a model right away. Kind of like cars. This is frustrating as I'm awaiting their new pro model in the later Fall.
If Canon folks make their pitches, they've got a very strong case also. Two things I think I'd give them are better autofocus and lower noise, though the E-330 has some low light tricks up its sleeve with the B mode of live preview.
Best thing, I guess, is not only to handle them both but take a memory card and shoot nearly identical pictures in the store with each and see which you prefer. For this, shoot in tif format so you don't have to worry about developing the raw files at this stage.

As the Canon and Nikon folks haven't tried to win you over, I'll take a stab at it. One advantage both have, especially Canon, is that you can use a wide range of prime (non-zoom) lenses. This might become something you care about. Another advantage is that these are the only two brands that currently have state of the art pro models on the market, although Olympus will (I believe) in late Fall. Some day you might care about this also. Finally, Nikon currently - well, come September - has a real value leader in the D80 (although, again, I think Oly will be in the fray just after this, and we can never count Canon out).

Whatever happened to making sure you purchased the camera that fit comfortably in your hands?

On a more serious not. You can't buy a digital camera based on price. You need to decide what you want to do with it. The type of images you want to produce, quality and size you want to print them at. System support in lenses, accessories or flash integration. Those are all issues that go into choosing a digital DSLR "system".

Canon and Nikon lead the pack with full system support. Nikon has better flash technology. I love that I can control multiple SB-800s wirelessly with my D200 and get accurate exposure.

I recommend nothing under 10 megapixels as the image quality is limiting.

Getting the feel of the camera - that was in my last post. On this note, I really do think you're best with a local serious camera shop (not one of the large chains), even if you pay somewhat more in the short run.
As for 10MP, well, as Larry noted, it depends on what size prints you want. If you want really big prints maybe you don't want digital after all, on a price per image size basis. As my last post also suggested, if you do take a memory card and try different options you can get a sense how much you want to pay for. You can test for more than just resolution, of course; you can give them a tough test drive for noise and low light focusing also.