http://web.mit.edu/8.02t/www/802TEAL3D/visualizations/vectorfields/CrossProduct/CrossProduct.htm
for
a cool applet on cross products.
other applets used for MIT multivariable calculus:
Some discovery applets on dot product, cross product
http://chortle.ccsu.edu/VectorLessons/vectorIndex.html
for an
online
tutorial on vectors
http://www.ies.co.jp/math/java/vector/index.html
lots of
vector applets
http://www.math.umn.edu/~rogness/quadrics/
interactive
gallery of quadrics