SUPER(C) is pretty good at most format conversions, and it supports nearly any format you throw at it and can convert it to nearly any other format, including DVD, VCD, and SVCD. Best of all, it's actually free. Not guaranteeing quality though. I've never converted to DVD.

www.erightsoft.com/SUPER.html

Funny how you still have to jump through a few hoops to get the download though.

Instead of conversion, have you ever thought of networking your 360 or PS3 (presuming you have one) up to your commuter. That way, no excess disc waste. I'm thinking too green today.