via a SIRIUS XM Radio Press announcement:
Effective immediately [November 12, 2008], and for the first time, XM subscribers will hear SIRIUS' dynamic and exclusive music, news, talk, sports and comedy shows and channels, and SIRIUS subscribers will have access to XM's equally diverse and unique content.According to the SIRIUS page here, TTRH will be airing on SIRIUS Channel 16 (Deep Tracks) Mondays 8 pm ET, Wednesdays 11 am ET, Thursdays 12 am ET, and Sundays 8 am ET.
As of 8 am Wednesday, November 12, the TTRH page on XM remains unchanged, and the Deep Tracks page shows the Wednesday air date to have moved ahead an hour to 11 am, paralleling the SIRIUS air time.
XMX Channel 2 - which aired TTRH all day on Wednesdays, appears to have been removed from the XM channel lineup.
It's unclear whether the SIRIUS Monday show at 8 PM will be a rerun from the previous week, although that's likely.