Skafia has made an awesome post on our forums about changing the carrier logo (upper left hand corner of the iPhone).
and some more instructions:
-----------------------------
** To change the logo, or change your ringtones, or anything in the
future, you have to "jailbreak" your iphone using the iphone hack found
here:
http://cre.ations.net/blog/post/custom-ringtones
--sounds-on-your-iphone-using-windows
Then, to change your carrier logo, just Plug in your iPhone (after it's
be "jailbreaked"), close iTunes and make sure you have 2 65x20 .png
files in your c:/phonedmg directory on your computer.
The first logo is the one you see on the homescreen, case sensitive:
FSO_CARRIER_ATT.png
The second logo is the one you see everywhere else in your apps:
Default_CARRIER_ATT.png
Make sure they are transparent so they look nice in the toolbars of
Safari and stuff.
Then you just run "iphoneinterface.exe" and once it connects, do the
following commands:
** EVERYTHING IS CASE SENSITIVE **
mkdir /System/Library/CoreServices/SpringBoard.app/
cd /System/Library/CoreServices/SpringBoard.app/
then type: putfile
/System/Library/CoreServices/SpringBoard.app/Default_CARRIER_ATT.png
then: putfile
/System/Library/CoreServices/SpringBoard.app/FSO_CARRIER_ATT.png
Turn your phone off, unplug it from your computer, then turn it back on.
Modify the iPhone carrier logo
April 12th, 2008 — iPhone Hacks, Tips and Tricks
Skafia has made an awesome post on our forums about changing the carrier logo (upper left hand corner of the iPhone).
and some more instructions:
-----------------------------
** To change the logo, or change your ringtones, or anything in the
future, you have to "jailbreak" your iphone using the iphone hack found
here:
http://cre.ations.net/blog/post/custom-ringtones
--sounds-on-your-iphone-using-windows
Then, to change your carrier logo, just Plug in your iPhone (after it's
be "jailbreaked"), close iTunes and make sure you have 2 65x20 .png
files in your c:/phonedmg directory on your computer.
The first logo is the one you see on the homescreen, case sensitive:
FSO_CARRIER_ATT.png
The second logo is the one you see everywhere else in your apps:
Default_CARRIER_ATT.png
Make sure they are transparent so they look nice in the toolbars of
Safari and stuff.
Then you just run "iphoneinterface.exe" and once it connects, do the
following commands:
** EVERYTHING IS CASE SENSITIVE **
mkdir /System/Library/CoreServices/SpringBoard.app/
cd /System/Library/CoreServices/SpringBoard.app/
then type: putfile
/System/Library/CoreServices/SpringBoard.app/Default_CARRIER_ATT.png
then: putfile
/System/Library/CoreServices/SpringBoard.app/FSO_CARRIER_ATT.png
Turn your phone off, unplug it from your computer, then turn it back on.
Rhododendron Software Releases FolioCalc 1.1 for Mac OS X
April 11th, 2008 — General Computing
Dual Boot Hack by iPhone Dev Team
April 10th, 2008 — iPhone Hacks, Tips and Tricks
I know this is a Apple Tweaks: Tweak Anything Apple Blog but man this iPhone craze is so fascinating. So here goes with another iPhone Tweak using a dual boot trick that the fellas from the iPhone Dev team have been using for a while. This hack is not for the squeemish since it entails some cutting, slicing, pasting, and more coding than I would know anything about.
So if you are into the major scripting and coding he is a cool link to check out! But then again if you are into the major hacking then you probably already know all about this release 
iPhone 1.1.4 Helpful Reads. and Hints
April 10th, 2008 — iPhone Hacks, Tips and Tricks
Sorry I have been gone for a while… but is anybody really there! Haha… (sigh) as I cry alone in my room :). But anyways here are some helpful links to some good reads for those iPhone hackers out there. The iPhone Dev team portal is probably the first place to start, since they kick ass at pwning the iPhone day after day.
Get your iPhone tools HERE
Enjoy
* The iPhone Wiki - The site that started it all for me. Lots of great technical information and history there, but unfortunately spammers have also invaded the site recently, making life difficult for the maintainers. (Now Defunct)
* The Hackint0sh iPhone Forums- Started up around the same time as the iPhone Dev Wiki, so again, a wealth of information and helpful people here.
* iPhone Dev Team Portal - Site for the original iPhone dev team. The people who started it all.
* iPhone Elite Dev Team - The elite iPhone dev team. Used to be quite active and open with information.
* Geohot’s Blog - Geohot is the first person to have a SIM unlocked iPhone (outside of Apple). Knows the iPhone hardware as well as the Apple engineers. Though his software skills are still in question… (hey, I cleaned up bits of the fake IPSF server code for my own use, so I’ve seen his code) 
* George’s Blog - No, this is not Geohot’s blog! But it’s still a good resource for understanding the technical details behind iPhone hacking discoveries.
* The Touchdev Wiki - Same structure as the iPhone Dev Wiki, but for the iPod Touch (or iTouch).
* iPhone Toolchain Project Page - Essential for iPhone application developers. Just make sure to release a standalone version of your killer iPhone app, ok?
* anySIM Project Page - The source code for anySIM. Interesting to me, maybe to you too?
* Nate True’s iPhone Utils and Info - Nate did a lot of the early iPhone hacking and maintained iBrickr for a while (kinda like iNdependence for Windows with a fancier interface — I’ve never been much of a UI tweaker — I enjoy the technical details more). Still a useful site for files and technical info.
* Erica Sadun’s Blog - Erica is one of the first major iPhone application developers and continues to produce interesting apps for the iPhone. Not to mention she has a loyal following amongst the sexually frustrated, male-dominated crowd of would-be iPhone hackers.
Hack Your iPhone into a Mouse for your PC
April 10th, 2008 — iPhone Hacks, Tips and Tricks
So I was doing some digital doodling last night and I was thinking to myself “I wonder if someone has made their iPhone into a mouse for their PC”… And of course before I could even finish that thought I see a link about some guy that tweaked his iPhone to connect to a server that allows his phone to act as a wireless mouse.
Sound unbelievable! Check it out for your self!
Thinking about finally pwning your iPhone: read more