It can be used to determine device type (NPN or PNP) and the base
http://www.imagineeringezine.com/PDF-FILES/xistrtst.pdf
http://www.lh-electric.4t.com/bin/gonogo.gif
http://www.anatekcorp.com/ttg/tiptrick.htm#Circuit Transistor Tester
use a current mirror and a power MOSFET to increase the output-current capability of an IC-voltage regulator
http://www.edn.com/archives/1996/020196/03di5.htm
http://www.4qdtec.com/mircl.html
test any MosFet device.
http://www.4qd.co.uk/serv/mostest.html
can produce high speed output signals with fast rise and full times.
http://www.imagineeringezine.com/PDF-FILES/pushpul.pdf
This circuit can produce high speed output signals with fast rise and full times. The unique change
http://www.discovercircuits.com/PDF-FILES/pushpul.pdf
Steve Bolt came up with an interesting smokeless 4-transistor H-bridge variant, i.e. no combination of inputs can cause the bridge to self-destruct.
http://www.solarbotics.net/library/circuits/driver_4varHbridge.html
some basic tests
http://www.elexp.com/t_test.htm