Hello all...
I just purchased an unlocked, jailbroken 8gb iPhone v1.1.4. The phone works great and I have had no problems at all.

I am totally new to Mac and the iPhone and I have much to learn. I wanted to ask a few questions:

As it stands now, if I ever try to upgrade from 1.1.4 my phone will become locked again? Is there anyway to unlock it again if I was to upgrade my firmware?

There are a TON of apps that I can install under the "install" program..way too many for me to comprehend. I am assuming whoever jailbroke/unlocked the phone put the app options on there?Which ones are worthwhile?

Do I have to use iTunes to manage my iPhone or are there other/better programs to manage my files/music etc. ?

Do the music files have to be in a certain format?

Thanks in advance for all your help.