Found this in a Wiki...
"Due to decreasing ticket sales, the league significantly softened its blackout policy in 2009. Though the traditional blackout rules still apply, the league is using some of its new media features to provide access to blacked-out games. For instance, the league will not subject its "RedZone" channel to any blackouts (the new RedZone channel, a new service introduced in 2009, cuts to live games when there is a significant potential for scoring)."
So even if my home team is blacked out, I still get to see the touchdowns?
Not technically a blackout - this probably explains why the RedZone goes silent at 8:00 ET...
"If the doubleheader network's games all finish before 7:30 ET, it is supposed to conclude the post-game show within 10 minutes to protect NBC's pre-game show. If any games finish after 7:30, the post-game can run until 8:00 ET."
<http://en.wikipedia.org/wiki/NFL_on_television>