Ive got to wait until the amazing haxors make an interface that would allow me to add 3rd party apps and icons to springboard without all the command line stuff... its all just too complicated for me - I dont even understand half the terminology.
I plan to do a lot more to it once I get my MacBook Pro. Right now I only have access to a Windows box and I don't feel like bricking my iPhone with Windows.
The carrier logo images are stored in /System/CoreServices/Springboard.app/Default_CARRIER_ATT.png and FSO_CARRIER_ATT.png ... obviously the above user changed his back to cingular. As you can see, I changed mine to iPhone.
You can't brick your iPhone doing this. I've tried. I deleted every file on the phone. Nothing happens. Restore fixes it no matter what.
By the way, I just got sftp configured correctly. Now all I do is drag and drop files using an SFTP client such as Cyberduck. So much easier than iPHUC! If you do it, just make sure you change the root password ...
Only thing that will get old about modifying is you have to do it every update, because it will have to be restored. Good thing Apple doesn't update often. Maybe there will be solution to bypass the file check soon.