Just visited USA's The 4400 Web page and saw that Saturday there will be a marathon of the season's first six episodes (all of them except for the current ep "Till We Have Built Jerusalem").
The marathon begins at 9 a.m. -- the perfect jumping on point if you've been intrigued by the idea of this show, but have not felt comfortable jumping on in the middle.
Personally, I got involved with the show during one of these marathons in Season Two, and I haven't looked back.
One curious note, though, I wonder if the starting time of this marathon is indicative of USA's lack of trust in the show's ability to win ratings? Previous marathons have started at like 1 p.m. and run up until prime time. This one will be done at 3 p.m. Curious... I mean, it was around this time of last year that we heard the show was picked up for another season... hopefully we get that announcement again soon...