From http://ivtv.sf.net/about.html:

"The primary goal of the IvyTV Project is to create a kernel driver for the iTVC15 familiy of MPEG codecs. The iTVC15 family includes the iTVC15 (CX24315) and iTVC16 (CX24316). These chips are commonly found on Hauppauge's WinTV PVR-150, PVR-250, PVR-350, and PVR-500 TV capture cards"

ivtv is a linux v4l2 kernel driver for TvTunerCards like the Hauppauge WinTV PVR-350 used in a recent WLUG MythTV presentation.

Some PVR cards have a MCE suffix - which says that the included software is just for WindowsMCE. These cards work fine under IvTv - you don't need to spend the extra for a non-MCE version.

More information can be found at http://ivtvdriver.org/ ( previously http://ivtv.sourceforge.net/ ) or at IvTvNotes