Quick Messenger Service at 1334 G street NW. Tell John that 15 sent you. (I'll get a referal bonus if you last 3 months, and will give you 1/2). It's a brutal job with no benefits, lots of fun if you're ok with that.
I think some people at Washington Express make more money, but the atmosphere maybe less cool. Bega Services has benefits and is worker owned. It's a small company, doesn't need new people that often, and probably hires only experienced. You might talk to them anyway.