Yes, Wales won the 2008 Six Nations Rugby Championship. They won it by beating all five of the other teams, to complete a Grand Slam.
England last won the Six Nations Rugby Championship in 2011, when they won 4 out of their 5 matches.
Scotland has never won the Six Nations although they won the last Five Nations in 1999.
England is the only team to have won both the World Cup and the Six Nations.
Since the Six Nations Rugby Championship came into being in 2000, Wales have won it twice - in 2005 and 2008. Both times they won it with a 'Grand Slam', which means they were unbeaten in all five of their matches.
they have won 3 times since the 5 nations changed to the 6 nations
The 2011 Six Nations Championship was won by England. It was their first Six Nations Championship title since 2003. England won 4 of their 5 Six Nations matches in 2011, only losing to Ireland on the final weekend.
Northern Ireland do not compete as a team in the Six Nations. There is an All-Ireland international rugby team. Ireland last won the Six Nations in 2009.
Since the Six Nations began in 2000 Wales have won the trophy three times. They are the current champions winning with a grand slam victory in 2012. Their two other winning championships were in 2005 and 2008.
The last time they won it was in 2010 when they also won the Grand Slam.
A grand slam is when in a six nations tournament a team has won every game they have played.