Hi,
yup, the long wire I was using was a cable that I bought to manually sync the camera to the flash to allow off camera firing. It forces the flash into manual where you have to set the power of the flash manually. 1/1 power, 1/2 power, 1/4 power and so on. I like using the flash in manual which I find useful when trying to balance ambient light and the flash light.
The problem with my manual cable is that although you can by them from speed graphic , warehouse express etc, it comes with the wrong connection - it's actually an extension cable. I had to cut my cable and replace on jack with the opposite (female / male) connection to use as you saw. So all in all it's about 20 quid.
The second type of cable is a special one from canon which allows metering so you can use the flash as if it were 'on' your camera. The cable is short, but again, you can splice / cut the cable and add an extension to it if you want off camera metered flash. The upside is you can adjust the exposure compensation of the flash through your camera, so you don't have to keep going to the flash to alter the exposure as you would in manual flash mode.
Or you could just try the wireless cactus triggers that tobers was using, which i'm considering buying next - I think a cable causes too many physical limitations, unless as above you really want metering / auto mode on your flash.
FYI, another option is to buy ''another' flash to trigger the off camera flash - but that's a 'if I had lots of money' option and not really applicable just now!
Hope this helps,
Mark.