There's a lot going on there...
First - you don't clear the floats in .prodprod, see clearing floats here
Second - when you float .entry-content img and try to put block level ul next to it, you need to make room for the float. Typically that would be a left margin the width of the float plus whatever space you want between them. Another method is overflow: auto; and padding. See how easy two columns can be here
Third - just a pet peeve of mine... what is .pic4prod doing? It is not needed to contain that image, you don't seem to be able to come up with any styling for it in the CSS - see divitis here