Yelsel,
Thanks! I actually have adjusted the limit screws and I think I have fixed the problem... I have shifted the chain off so many times when going fast (because, that's when you shift into the big chain ring), that now I'm a tad hesitant to make that shift...
I also totally hear you about a too heavy commuter...

So, if anyone is interested in a 46cm LHT (2008 model in the grey-blue) with pink planet bike fenders, pink water bottle cage, black brooks saddle... um.. PM me. (excellent sales pitch for the bike, right?) I am beginning to think I should just tour on my Bianchi like I did last summer, and buy a single speed or something light for my around town bike. I think I'm just too ...um, slight (?) for the beefiness of this bike. I have been coming to this conclusion, and it's a bummer, but the wrist thing seems to have brought it home for me... oh, also I have studded tires for the 26" wheels - if anyone is interested, um, we can discuss the studded tires too...