I came across a cool utility for Home Theater PCs doing TV recording. I have played with several free and open source PVR applications, and while there are various sources to obtain reliable program guide listings, most charge a nominal fee for the service. MC2XML allows you to leverage the guide data servers that Microsoft uses for their Media Center software. It outputs the data in standard XMLTV format, so it can be used by any application that supports XMLTV.

"mc2xml is a small and fast standalone command line program for Windows/Linux/OSX that downloadsmedia center, titantv, or schedules direct tv listings and outputs an XMLTV formatted (xmltv.dtd) .xml file."

Link