Here is a list of station automation software (and the stations that use the software) that was collected by Jeff Shaw. Jeff is creating a guide to automation for the Prometheus Web site.

KVLP-LP (dvd)
WBCR-LP (megaseg)
KRFP-LP (winamp +)
WRYR-LP in South Arundel (iTunes +)
WSLR-LP (megaseg)
KREV-LP (mac)
KDRT-LP (rivendell)

others:
SAMbroadcaster
campware.org (campcaster)
ZaraRadio
stationplaylist.com
raduga
DirEttore