If you have a high-end Powershot like a G2 or Pro90, chances are you consider yourself an advanced photographer of one stripe or another or have ambitions of being one. Either you're moving up to a more-capable digicam, or you're a film shooter willing to give digital a shot. Chances are, if you're like me, you have a bunch of other camera gear lying around the house and you'd like to use some of it with your new Canon.
http://www.botzilla.com/photo/G1strobe.html
http://www.botzilla.com/photo/G1strobe.html