Here are some links, in case you didn't check:
F-20 Tigershark Home Page -
http://www.f20a.com/Examine a detailed timeline of F-20 events and a crash report, as well as specs on the Tigershark's handling capabilities, radar, engine and more. This page also features an F-20 photo gallery.
F-20 Tigershark -
http://www.californiasciencecenter.org/Exhibits/AirAndSpace/AirAndAircraft/F20/F20.phpThis page from the Federation of American Scientists' Military Analysis Network features sketches of the F-20 test-flight paths and a great cutaway illustration that shows many of the F-20's special components and armaments.
Northrop F-20 "Tigershark" -
http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=2291The U.S. Air Force Museum offers a brief analysis of the Tigershark's lack of success in foreign markets on this page, which also includes a photo gallery. - Some pretty nice images here...
There is also a Specialty Press book (WarbirdTech n°44) which deals with F-5 Freedom Fighter, F-20 Tigershark and T-38 Talon