Jack Roush has bought Mark Martin's share of the #17 Nextel Cup team that Matt Kenseth drives. Martin is listed as the owner of the car, though it was Roush that sat at the head table with driver Matt Kenseth when the team won the 2003 championship, and it is the Roush Racing umbrella under which the team competes. Martin is leaving Roush after this season as he stops competing full time in NASCAR, at least for next season. Martin plans to share the Bobby Ginn-owned MB2 Motorsports #01 with rookie Regan Smith next season, with Martin driving in 22 races.(SceneDaily.com)(11-18-2006)