Nothing new, I don't expect anyone to try getting proper Cappuccino support in Xcode. Use a dedicated editor like Sublime Text 2 or TextMate, there is a Cappuccino bundle which provides colored syntax support with code folding.
http://www.sublimetext.com/dev
https://github.com/aparajita/Cappuccino-Sublime
Regards,
Aparajita
Cappuccino Core Developer
https://github.com/araxara/cappuccino/tree/Xcode/Tools/Editors/Xcode
You will probably have to edit the DVTFOUNDATION_PATH variable to point to the appropriate path for your Xcode installation. Some examples are provided. The ObjectiveJ.xclangspec file which is in the Git repository has not been updated to version Objective-J version 2.0, but should provide more than adequate editing support. If you do update the xclangspec just let me know and I'll update the repository.
You will manually need to select the proper language in Xcode (Editor -> Syntax Coloring -> Objective-J)
Hope this helps you.
Alex Karahalios
/private/var/folders/nx/5lx_7_cx4nb15m44mntrs5b0000103/C/com.apple.DeveloperTools/4.3.2/Xcode/PlugInCache.xcplugincache
The first part of this path can be found using the lsof command (list open files) on the Xcode process and searching the results for cache files.