According to this link on Apple's Developer site (login required):
you use the Certificate Assistant in the Keychain Access utility to create a Certificate Signing Request (CSR), which you submit for approval using the Program Portal of the iPhone Developer Program
Well I've created the certificate but I've had no luck finding out how to submit the certificate for approval. I was hoping to do this without signing up for the developer program ($99) since I only want to test apps on my iPhone - not submit them to the App Store (yet).
Can someone post the link to the "portal" where I can submit this?