One way I would suggest if you have CS3 is to use a 'Quick mask'. Get the brush tool and make sure you're painting black. Then hit "Q" and paint over the background. It'll put an overlay of a colour, by default I think it's red, when you're done hit Q again and it becomes a selection.
I did not know that, and have been trying to find out how to go about it, Wow , thanks for the tip, I will look into it now, being I have a nice logo I want to remove of a background. Im going to try gikmp first and see if they offer that option, and if they do, I will be happy