I didn't see a thread for this, but Lyft (unlike Uber, sigh) seems to have quite a few promo codes all the time for various forms of rides. I thought maybe we could start a wiki or at least a thread for all of them.

The ones that I know of currently are:

FLY2015 - $5 off your ride to/from the airport, can be used twice, but only for select airports.

Please feel free to add yours.