Actually the GC almost surpassed the Xbox in units sold. They are no longer dead last in the last gen console wars. Microsoft stopped selling Xbox units a while ago, Nintendo still sells GC units. The result? The Xbox will soon be dead last this year or a close tie. The PS3 could do the same thing later on.
GC- 21.52 million (December 2006 Continues to sell)
Xbox- Units sold 24 million (No longer produced)