Although it is unusual for DOT to have more than one SBIR phase I solicitation per year, they just opened a second phase I solicitation July 18, 2008.  This is a smaller (3 topic) solicitation that will close September 5, 2008.  DOT's previous FY-2008 solicitation was released on April 15, 2008 and closed on June 3, 2008.

The DOT solicitation is contracts based, so it is available on FedBizOpps, but the best place to get it is on DOT's SBIR site at www.volpe.dot.gov/sbir  It's available in Word, PDF or html.