The following was taken from a JetBlue press release:

Key provisions of the JetBlue Customer Bill of Rights are below, and have been made retroactive to Feb. 14, 2007:

-- JetBlue will notify customers of the following:
- Delays prior to scheduled departure
- Cancellations and their cause
- Diversions and their cause

-- JetBlue will take the necessary action to deplane customers if
an aircraft is ground-delayed for five hours. JetBlue Captains
have discretion if the aircraft is positioned and almost ready
for take-off.

-- If a flight lands and is unable to taxi in to a gate right away,
the following compensation will be made for customers:

Delayed 30-60 minutes
Customers receive a $25 voucher valid toward the purchase of
their next JetBlue flight

Delayed 1-2 hours
Customers receive a $100 voucher

Delayed 2-3 hours
Customers receive a voucher for the full amount of their
one-way fare.

Delayed more than 4 hours
Customers receive a voucher for the full amount of their
round trip.
Note: JetBlue fares are all one-way; round trip purchase is
never required.

-- If a flight has a ground delay on departure, the following
compensation applies:

Delayed 3-4 hours
Customers receive a $100 voucher

Delayed more than 4 hours
Customers receive a voucher in the full amount of the
customer's original round trip.

-- If a flight is cancelled within 12 hours of scheduled
departure, and it is a situation within the control of the
company (as opposed to weather or ATC delays), customers may
choose a full refund or a full credit, as well as a voucher
valued at the cost of their original round-trip.

-- If JetBlue delays a flight in a situation within the company's
control, customers can expect the following compensation:

Delayed 1-2 hours
Customers receive $25 voucher

Delayed 2-4 hours
Customers receive $50 voucher

Delayed 4-6 hours
Customers receive a voucher valid for the full amount of their
one-way fare.
Note: JetBlue fares are all one-way; round trip purchase is
never required.

Delayed more than 6 hours
Customers will receive a voucher for the full amount of their
round trip.

For more information, click here to visit JetBlue's Web site.