Can I share a 3G connection from an iPhone/iPad by creating a Wi-fi hotspot? I've been wondering about this for awhile. So, is it possible to create a Wi-fi hotspot from an iPhone or 3G iPad?
Yes, it's called "Personal Hotspot" by Apple and works on iPhone 4 and 4S. Here is an Apple support doc on it.
Not available on the 3G iPad though, as far as I know.