http://wonka.physics.ncsu.edu/~blondin/Blackhole/title.html
http://www2.ari.net/home/odenwald/qadir/abholes.html

http://antwrp.gsfc.nasa.gov/apod/ap970105.html

Cyg X-1: http://www.owlnet.rice.edu/~spac250/steve/index.html

BH questions http://physics7.berkeley.edu/BHfaq.html

tut http://www.astro.ucla.edu/~wright/relatvty.htm