Duh. The 3GS was a marginal upgrade.
Compared to the 1 to the 3g? The 3GS was a substantial upgrade over the 3G.
Processor speed increase of 200Mhz, doubled the internal RAM, added video, added compass, added voice control, camera bumped up 1MP and included auto-focus and tap to focus, included increased battery life, doubled the memory size to 16/32GB.
My wife's 3GS is substantially faster and smoother than my 3G. However, I think my 4 is going to be substantially faster now