I have an Olympus and I like it a lot. Takes very good pictures.
There are 2 downsides to buying an olympus, and they may not be a factor for you ...
1) the new olympus cameras will only use Olympus' proprietary storage media, which is, of course, the most expensive one available. (mine uses SmartMedia, which is an open standard)
2) (this is the one that may not be a factor) If you're interested in underwater photography, there are housings available for Olympus cameras, but they're not made by Olympus, and thus, very expensive. (Some other companies, notably Canon, with their S-50 (and possibly others) makes their own underwater housing, which is a bit more affordable.