Darren Oliver in 2006 had to be one of Omar Minaya's best signings. Picked him up off the scrap heap, he barely made the Opening Day roster, and he's been experiencing a career rejuvenation ever since.
Conversely, not bringing him back after his 2006 season was one of Omar's biggest fuck ups. Didn't wanna hand out multi year deals to re-sign Oliver or Chad Bradford because he didn't think non-closing relievers should get multi years deals. Then he gave out a 3 year deal to noted terrible pitcher Scott Schoeneweis.