I am sure you know this already, but everything I've read states that you can plant in the same place next year. Blight does not survive in the soil over the course of the off season.

late blight doesn't but early blight does survive as I understand it- in soil, on stakes etc. It is always the safest practice to burn all diseased plants, and then plant in a different spot in the garden next year (standard rotation). If you only had late blight though, it might not be so important. I am in the NE and had both this year.

This video (link below) has great information on late blight diagnostics and management, and does a good job of describing details of the biology and life cycle of this disease. Normally, late blight in the north is a rare problem on tomatoes, but what happened in 2009 was very different, and makes for greater potential of recurrence in 2010.

Here is a link that might be useful: eOrganic Late Blight webinar