(We're told that Clear's similar 3G/4G i Spot solution is currently a no-go with i Phone 4.)Next, in terms of performance, was My Wi.
My Wi creates a Wi Fi hotspot using a jailbroken i Phone's 3G service.
We tested using a 3GS for the hotspot and connecting to that hotspot with an i Phone 4.
My Wi performed better than the Mi Fi but had significant service interruptions.
Once recorded, you can upload your videos directly to You Tube or serve them over your local Wi Fi network using a Web Server interface.
Video chatting doesn't require any additional software, but only some browsers are supported if you're chatting from your computer.
We've all been using Face Time like crazy here at TUAW central -- it's really great to be able to conference with friends in real time without having to arrange things in advance. Knowing that your friends have i Phone 4s makes video calling much easier.
Performing second best in our tests, and providing a huge improvement over the hotspot solutions, was 3G Unrestrictor from Kim Streich.
Offering a native on-i Phone solution, it outperformed both Mi Fi and My Wi but it was slightly less reliable during our tests in terms of audio and video than Intelliborn's My3G, another native application.