If I understand correctly, the zoom is equivalent to 38-380 mm (10x). That kind of zoom is phenomenal in my opinion for a digital camera. I have tried the 2100 in a store, and liked it very much. After trying out a Canon Pro90 IS, I opted for that, but mainly because the Pro90 uses compactflash which I prefer and a few other features. But basically they are very similar cameras with reportedly the same lens, and if they are as similar as I think, you will love the Olympus 2100. Incidently the 2100 it is usually much cheaper than the Pro90 as well.
I posted a bunch of my pictures from the Pro90 in a thread recently with the name Pro90 in the topic line. Supposedly the 2100 is a little quicker with the autofocus and lag between shots is shorter (ie faster). The 2100 is 2.1 megapixels, and the Pro90 is 2.6 megapixels, which is not really a huge difference.
I remember checking out the Pro90 IS too and really had a hard time deciding between these two cameras. I did heaps of research on both models and decided with the Olympus in the end because I preferred the design.
Remember Ben, do heaps of research and try them all out and ask to see the print output of the cameras when you're in the store.
I purchased this camera early last month and I like it alot. My photos on this site from August till now have all been shot with this camera. A few weeks ago I captured some nice approach shots. I submitted these shots a few days ago and they are pending approval. Even if they don't make the cut - I am very satisfied with this camera. It is a very good value.