Thanks for the advice everyone. I've got the lights and the constant pedalling down (my girlfriend does that coasting thing and it bugs me to know end when she's going slow and i'm ready to break away down the hill like Lance!) The commute's only about three, maybe four miles and it's all uphill save a few flats spots. My bike right now kinda sucks but it's heavy enough that when I trade up to a trek 1000 or similar bike I'll have to put considerably less effort to go farther.