Last year, every NFL stadium sold out for the first ten weeks. I blamed the "Bush economy"--tax cuts left too many people with extra disposable income to spend on football tickets, unlike earlier in the decade when people didn't have funds to spare on their local crappy team (used to be able to see the Colts for free after purchasing four weeks' of groceries from Marsh... *sob*).
This year, Jacksonville (spittle be upon them) couldn't sell out the second week.
I don't THINK that's a sign of an economic downturn. Jax relies heavily on fans of opposing teams to get the sell-out (I'm sure that's how Arizona pulled it off last year), and Atlanta fans aren't dedicated enough to drive four hours to watch Joey Harrington.
But I could be wrong. It's happened once or twice before.