Canvas "Matrix Rain" proof-of-concept

Implementation Notes:

• The motion blur is generated in code by not completely clearing the frame on each cycle. Note the "0.5" alpha parameter:

  fillStyle = "rgba(0,0,0,0.5)"

• Safari 4 / WebKit really struggles with throwing around so many images; at least compared to Firefox 3.5. There's about a 50% performance degradation.
• Images borrowed from Thomas John's Matrix Fall screensaver.