The Tomas Kaberle era, after several scuttled past departures, is officially over in Toronto. And the Maple Leafs' rebuild continues with yet another significant trade.

The Leafs today sent Kaberle — yes, he agreed to waive his no-trade deal — to Boston for prospect Joe Colborne, a 6-foot-5 centre with Boston's AHL farm team at Providence, a 2011 first-round draft pick (but not the one Toronto sent to Boston in the Phil Kessel trade) and a conditional pick, thought to be a second-round pick in 2012 if Kaberle resigns with the Bruins or if Boston makes the Stanley Cup final this season.

Colborne was drafted in the first round by Boston, 16th overall, in the 2008 draft. Although he is a towering presence, the 21-year-old isn't known to be particularly tough. In 55 games with Providence this season, he has 12 goals and 14 assists for 26 points along with 35 penalty minutes. It is believed that he could be ready to play in the NHL next season.