Thanks for the nice comments and advice. I've gone ahead and switched to sRGB(IIIa) and upgraded to a pro flickr account to share more photos.
I'm also getting progressively more comfortable with the camera. If you're interested in seeing a few of the "fun" photos that I've taken since getting back to Tokyo, here's a link to a small set.
Tokyo Fun - March 2007 - a photoset on Flickr