I'm no Mac / ObjC developer, but I do plain C for my Linux open source projects. I know the how JB sets the bar in the IDE world, so I imagine that plain C development experience in IDEA would be leaps ahead of Eclipse.
Is it going to be possible to use appCode to do plain C on other platforms than Mac? If not, is it possible to release the plain C part as a plugin for IDEA? Any other ideas?