My sidekick 3 was close to the junk pile today, so I got a three week old used iPhone off Craigslist. I have a good deal with TMobile, so I decided I would try to unlock the iPhone and load on 3rd party firmware
I had looked at ZiPhone.org previously and it looked pretty good. Good enough to blindly install it on the iphone I just paid a few hundred bucks for. Downloaded ZiPhone 3.0, inserted my sim card, hooked it up to the mac, opened the program, and clicked unlock. The timer started at 4.5 minutes.
Saw a lot of terminal scroll across the screen (cool!). Had the obligatory panic attack ("I'm going to turn this thing into an expensive paperweight"). Four point five minutes later I had a working ZiPhone. Stuff hardly ever works like that, you know what I mean?
Thoroughly impressed, donated 20 euros ($32) to the author. Top notch experience, and this is a great phone.