Hi. I want to create a "light show" using my computer to create the
program and then hook it up somehow to colored light bulbs so that
when I play my media (which I will create a computer video via Flash
or Swish on my computer and compile it to music), the lights will
reflect to the colors/sounds of my computer.

Can this be done?  I want to do something like the "Fremont
Experience" in Las Vegas, but on a much smaller scale.

Please help!

If you can find an audio spectrum analizer that has support for
signalling an output, starting with something like
http://www.codeguru.com/Cpp/G-M/multimedia/audio/article.php/c4725/ or
http://www.fftw.org/ for fourier transforms... essentially, if you can
find a way to capture the peaks you want, you can send a serial signal
to a light controller.. It's not a project for the faint of heart.

You need software to convert sound to signals; hardware to convert
signals to actions, and actions that manipulate lights. On a
professional level, this can also be handled through Midi. Midi *is*
the way to go. However, onboard soundcards have tended to dump the
MIDI port from newer computers. The goal would be to find peaks of
wav/mp3 audio and convert those peaks to MIDI signals which control a
MIDI light controller box.
http://tomscarff.tripod.com/midi_light/midi_light_controller.htm is a
sample how to make your own... The device is a single channel light
controller. The channel can have a Note-On from 0-127, which is very
diverse.