Theres actually quite a few and all of them would be found in this EPG forum.
http://forum.team-mediaportal.com/se...p?mode=results
You can use WebEPG which comes with MP built in. You can also use another grabber called TUGG written by angusmann on these forums, or a variety of other MCE2005 ones (ie Bladerunner Pro or FreeXMLTV).