ESPN Stadium Tour
MLB Valuations
MLB Attendance
Canadian MSA Data
US MSA Data
Ticket Prices (2006)
How the Luxury Tax works (*The one I devised isn't the same...and it wasn't intended to be. It's based on market size deficiencies and is intended to do that on purpose.)
Median income, by place, USA
Who fans root for, a US map
US Census Population Projections 2004-2030
That should get you going...and the DMA spreadsheet listed above is also super useful and I used that, too.