Taveras didn't hit much in his 37 plate appearances for the Nationals this year and hasn't been a serious offensive threat for a couple of years. He posted a .367 on base percentage for the 2007 Rockies and led the National League in stolen bases the following season. He has bounced from the Reds to the Nationals to the Phillies since, without much success.
But the seven-year veteran is relatively young (he's 29) and has plenty of experience (601 games) in center field. He'll provide the Rockies with depth and speed, though he doesn't appear to be the difference maker he was a couple seasons ago.