Dear avenue33,
I'm a complete newbie on Xcode but since I wanted to have a bit more advance IDE than the Arduino provided one and I'm on a Mac, I went for Xcode and your template embedXcode. I've tried to follow your installation guide but I must say it could be more extensive when it comes to where a certain dropdown menu is instead of just saying "the dropdown menu", like on page 37 when selecting a target. And the pictures could also be of higher resolution so one can actually se what's written in them. But I'm not just wining, I'm giving you hopefully constructive feedback because I really want this to work! 
Also, when I build the default code in a new project I get the following error message:
Argument list too long: recursive header expansion failed at /Applications/Preview.app/Contents.
And loads of messages of the following type:
Warning: no rule to process file '$(PROJECT_DIR)/TestOfXcode/Arduino/cores/arduino/Arduino.h' of type sourcecode.c.h for architecture i386
Any hints to get in the right direction?