Sorry for the slight thread drift but there seems to be a lot of comments being banded about over Boeings, particularly the 737, packs off takeoffs possibly being problematic if you "forget" to turn them back on (understandably), however I find it surprising that it doesn't have a built in automatic system to turn the packs off for the take off and then back on in the climb.
I have never flown a 737 however I have experience on 717 (yes, some may say it is not a real Boeing given it is a derivative of the DC-9) and a packs off takeoff in it is a non-event. Simply select "Packs OFF" on the "Takeoff" page of the FMS and it does the rest. When you power up for takeoff the packs automatically shut down, when climbing through 3,000' AGL they automatically come back on. Would of thought this feature would be more common.