We almost finalized the crawling process, and will release the sample data on May 31st. Be sure to sign up for the training data set, and to submit your application to participate in TREC 2013 as described on: http://trec.nist.gov/pubs/call2013.html
Best wishes, Djoerd.
-- Djoerd Hiemstra University of Twente Department of Computer Science PO Box 217, 7500 AE Enschede, The Netherlands