Robert Blass wrote:
Am I the only one who is annoyed at those DTV conversion public
service tv ads? They run often, about 7 times and hour no matter what
is on the schedule...

The stations are required to run the announcements on top of spending
millions of dollars to upgrade their transmitting equipment. See
http://www.kcra.com/download/2008/0710/16846064.pdf for a report one
station submitted to the FCC.

I haven't formally observed it, but there exists a possibility that
stations aren't running the crawls on their digital broadcasts.