I use pocket wizards to trigger off camera flashes myself but that is kinda the expensive way to do it. Ebay has some cheaper triggers but from what I read they are not near as reliable as pocket wizards. As far as triggering with the on cam flash I think you can do that but if you "turn down the flash" on cam enough that it will not light the subject, then I doubt it will have enough to trigger the 580. Another option is a cable that goes from cam to flash but it is only like 2.5' long and generally you will want the flash farther away.
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Gripped Canon EOS 5D Mark II, Canon EOS 40D,Canon 85mm 1.2 L, Canon 70-200mm f/2.8 L IS USM, Canon EF 24-70mm f/2.8 L USM,Canon 10-22mm f/3.5-4.5 USM, Canon 100mm f/2.8 EF USM Macro, Canon 2x EF Extender II, Canon 28-135 (kit lense), 580EXII Speedlite, 480EXII Speedlite x2, Pocketwizards
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