My hypothesis? A LOT of #7s went into mothballs in the offseason, replaced by 43.
I'd say that's a wise guess. Especially since I know specifically of a dad who bought his daughter a new #43 to replace the #7. (okay, I've let her start wearing her #7 again).
Following Polamalu in jersey sales were Saints QB Drew Brees, the 2009 league MVP, and popular rookie quarterback Tim Tebow of Denver
But he's a Christian...which MUST mean he's a good QB.