Southwest Airlines has launch a new little ding to help consumers get their lowest prices and other exclusive offers. Register and download their DING! software to help you find discount fares.

Cons: You register to receive advertising from a company. Doesn't support Macintosh.
Pros: Frequent travelers may appreciate receiving valid information straight from the source. You simply bypass email and anything that looks like spam. Wat's not to like about something called DING!