A friend of mine talked to me in ICQ one time and informed me about the newest iphone unlock method for 1.1.4 firmware.
Disclaimer: I have never used this yet (for I don’t have an iphone). But I will try this with my Ipod Touch, which I was able to unlock for 1.1.2 but not yet for the latest one.
http://unlockcellphonecode.com/2008/03/01/unlock-your-iphone/
Feedback is appreciated 