Justin.tv has unfortunately been shut down.
It's been a great resource and allowed me to enjoy Japanese baseball in a way I would never have guessed years ago when my in-laws were still sending/bringing us VHS and DVD recordings of games.
It has also been the best, easiest place to find recorded playoff games the last few years.
But now it's gone and there are alternatives out there, Reddit NPB is a good resource for finding games.
Update: Where the heck am I going to watch college football games? Go Dawgs!