Lil Wayne is back in the number one spot on the Billboard charts [Coldplay's Viva La Vida briefly pushed him to #2 for a week] after selling 156,000 more copies of "Tha Carter III" last week, racking up a grand total of 1.68 million sold after four weeks on the chart, while 50 Cent's new joint "Terminate on Sight" debuted at No. 4 after moving a measly 102,000 units.