Running intercooled you will get more hp per pound of boost... more consistant power... it is less stressful on the engine... you minimize the chance of detonation or knock... I could go on and on.
You could stand to pick up 15-25hp by simply bolting on a IC. It is one of the cheapest ways to make power on a boosted car. You won't have to worry about IATs spiking when it gets hot outside in the summer or your car falling on its face after a few pulls.
I realise some of you guys have been running non-intercooled for years... but spend a little money and slap one on there.. your car will thank you.