I love OneBusAway -- thanks for your work! We've got it in active use in Detroit, powering 100s of thousands of requests a day. Wish I could contribute to the core (I'm not a java dev) but it's a truly impactful system.
That's awesome! Are you only using the backend, or are you using the mobile clients, too? I'd love to talk with you more about the Detroit deployment as this is the first I've heard about it. Can you email me at aaron@brethorsting.com?