What's the difference between an iPhone and iPod (touch)?

Besides how an iPod can't be used like a phone.
Is there any other differences between an iPod Touch and iPhone?

The iPhone is a fully functioning mobile phone as well as an iPod touch. With the iPod you can download apps that allow you to use it as a phone but they aren't as good. I recommend getting an iPhone 3gs, I have one and it works great!

An iphone has everything that an ipod touch has but it can call and doesn't always need to have Wi-Fi for certain things. The iphone it a phone put together with an ipod touch.

Well a phone also has 3G or 4g so that you can have Internet on the go. Other than that And the phone thing, they are pretty similar.

IPhone is thicker and heavier. The iPhone also has more memory available(not space available[2 different things]). That's pretty much it besides the calling thing.