Ian: Yup, you're right it is pretty much the same thing - which was my point ;-) However, I'm surprised how many people fail to see it that way.
I was talking to a guy I met on a previous project a couple of weeks ago who was having scaling problems with their Java based CMS. Proxying the (almost completely static) content hadn't occurred to him. Most odd since he was a technically literate bloke.
Somehow the attitude that "we could change this at any time" overrides the reality of things only changing once every three months. One Apache mod_proxy later and suddenly they don't have to purchase another Sun E350. Odd, but I've seen the same pattern several times.