Recently, because of defects with a third party library that we were using for 10,000, I had to figure out if our code was running on the iPhone Simulator and not do a few things. It's not complicated code, but it's not a bad little snippet to keep handy in your programming toolbox. Here is the code I came up with. Please for you to enjoy...

NSString* model= [[UIDevice currentDevice] model];
NSString* simulator = @"iPhone Simulator";
if ([model compare:simulator] == NSOrderedSame)
{
//Simulator!
}