On the same site, if you click on the link for 'State sales tax paid...' it tells you that if you have your receipts, you can itemize your deductions, OR you can go by a table that they created at:
http://www.bankrate.com/brm/frames/h...s-pdf/p600.pdf
If anyone finds out more on this, stipulations, etc., definitely let me know. Would be nice to writeoff an extra 600+ dollars this year.