I agree. All of my digital cameras have been produced by Canon (300D, SD300, S45). While there are good arguments to buy specific cameras from other manufacturers, none have been as consistant as Canon.
However, before digital cameras, everyone in my family owned Olympus 35mm cameras, from the all-weather Stylus lineup to the OM models (I had a OM PC, my father had an OM-1, etc.). I loved having ESP and spot metering, a feature which Canon has ignored. One of the main sticking points for me, over and above feature/price comparison, has been the lack of CF/SD slots in the Olympus models (At the time of previous purchases they only had models with xD picture card slots).
The E-400 looks like it would be similar to the OM PC (i.e. entry level SLR) and probably would be one of the first cameras by Olympus to cause me to sell my 300D kit. I would definitely take a hard look at it over the Rebel Xti 400D.
David