Sonora Review published their double issue last spring (issue 55/56: order here), half of which was a tribute to DFW, and is certainly worth the read. Of course for the DFW-obsessed it is essential reading as is the issue of Five Dials mentioned below. I have a couple extra copies of said issue of SR which also includes an excellent essay by one Sean Lovelace. I'd love to pass these to someone who would be interested in taking a look and blog posting here about it if there's anything that interests you. Email me with your address and I'll send it off.