Depending on where you're going....
One hidden benefit of mechanical delays is that you can pretty much reroute yourself onto any airline. You can "double dip" by earning miles for the flights you should have taken, and miles for the airline you do fly.
To clarify, you can earn miles in 2 different programs. If you are booked on NW and you reroute onto CO, I don't think you can pool all of these in a single Co or NW account.
Aside from that, I think a meal and a phone call are pretty standard.
[This message has been edited by Viajero Joven (edited 12-13-2000).]