Since snail mail is regarded more highly than an email, be sure to have that as the top priority, then email daily to flood their staffers.

Email:
darkangel@industrialvelvet.com
askfox@foxinc.com

Write:
FOX Broadcasting Co.
P.O. Box 900
Beverly Hills, CA 90213

Since DA won't be on the Fox Fall line-up, try to convince them to pick-up Dark Angel as a midseason replacement. Remember to keep calm, no obsenities, and point out positive reasons why Dark Angel should be brought back and NOT why Firefly shouldn't be there.

If you send it through snail mail, be sure to stuff the envelope with tons of barcodes.