Links provided by Robert Pronovost

American Dad  http://www.tvtdb.com/americandad/transcripts/1x01.php
Simpsons  http://www.twiztv.com/scripts/simpsons/season8/thesimpsons-810.htm
Sabrina the teenage witch  http://www.tvtdb.com/sabrina/transcripts/1x01.php
The Tick  http://www.twiztv.com/scripts/tick/season1/thetick-102.txt

Additional transcripts can be found here (including Mr. Rogers' Neighborhood):

The Television Transcript Project http://www.geocities.com/tvtranscripts/index.htm