ah...
each version has their own goodies
but i like Photoshop CS just because it's the latest one
they said there is this two feature which you can reassemble pictures with difference size but all from the same picture to it's original state.
and another one is color changing
say there is a woman who is wearing red, with shadows and etc.
cs can change it to blue or whatever without lossing anything like shadow, curves and etc.

all these sounds good to me, but i never got to the point of actually using it

i heard a guy who is a graphics designer of some kind use all versions of photoshop, 6-cs for editing
he said everyone has there own unique feature, but i don't get it since i never used it for a long time.

captainsaneo~
illustrator should work just like photoshop does
don't know what you actually did, but you have to export the image to .jpg or other common format in order for the browser to display