Some other sites not to be missed if you're looking for aerofoil data:
Michael Selig's site at UIUC. His airfoil database includes coordinates and test data for a huge number of aerofoils not just the Selig ones:
http://www.ae.illinois.edu/m-selig/ads.htmlMartin Hepperle's site (Martin Hepperle as in MH aerofoils). Data for MH airfoils and some other interesting bits and pieces:
http://www.mh-aerotools.de/airfoils/