Bernoulli's Principle is often invoked inappropriately.
Here's a collection of sites where the right explanation
was finally found. So far there is only one. More to
The Evil Shower Curtain
Be sure to read all the way to the end. Including the
link at the bottom. GBA
Bernoulli's Principle is widely used as an explanation
for the lift of an airplane wing, and other applications
involving compressible fluids. However, there may be
problems with these applications of the principle.
You can find a discussion of possible difficulties here,