TiVo's 7.2.1 software update will now include overlap protection, which will prevent you from missing the beginning of a show if it overlaps with another, less important, show in your schedule. Big deal? Kind of. This essentially solves the problem of TV programmers tacking on an extra minute or so to foil PVRs and piss off TiVo owners.
The system rates the shows by importance and stops recording the "less important" shows when more important shows start. Works on Series 2 TiVos.
Update: The overlap protection gets a nice dissection at Zatz Not Funny...
TiVo Adds Overlap Protection [PVRBlog]