Upgrade: Travel Better has good some ideas on how you can avoid those excessive airport rental car fees (you know, the ones like “facility fee.” What is that, you have to pay a fee for the rental place having a roof? Can I choose the place without a roof then?) One idea is to rent at the airport, then drop the car off the next day downtown. This way you only pay extra airport fees on the first day. Just make sure the place isn’t going to tack on a one-way dropoff fee. This is even better in Europe, which isn’t as into one-way fees as America is.
Avoiding airport rental markups [Upgrade: Travel Better]