ludicrously simple!
Was on
1.1.1 jailbroken / unlocked (with anysim ) / week 38 iphone.
This was performed on macbook running 10.5.2 ( leopard )
Running itunes 7.6
* Installed the latest ZiPhone 2.4 for OS X (with GUI ) from here:
http://downloadziphone.org/ZiPhoneOSX-2.4.tbz
* extracted ( using firefox clicked on open ).
* read the README ( click about / readme ) just to be safe

.
* restored iphone to 1.1.3 ( clicked restore and followed all the default screen prompts )
* once restored itune's displayed "unknown sim" white screen while iphone displayed the wire and itunes disc icons with the unlock slider showing "unlock in emergency" in 3 different languages.
* while itunes and iphone still in above state ran ZiPhone with all 3 of the standard options selected ( Jailbreak, Activate and unlock ) and clicked "start"
* got the following info in ZiPhone's progress log:
* During the process itunes reports a number of things but eventually reports that a new iphone has been connected.
* During the process the iphone itself displays lines of code (what the program is doing ) in white. Eventually the iphone returns to the friendly world background with my network carrier in the top left!
* Disconnected my iphone from the cable, restarted my iphone, reconnected to cable and re-sync'ed my backup! everything worked as before ( youtube ).
QED...
Simplest jailbreak / unlock I have EVER DONE!
Thanks to everyone who worked on ZiPhone.