I had a problem yesterday, if you download Xcode, the is the Xcode.app thinggy, you drag it to apps click it, it does some magic and it's read to go (you might thing). I wen inside the Xcode.app and there you will find all the /Developer Framework Lib stuff, you need to link it from there to /Developer to make everything work (i got that yesterday) and Introjucer built fine after that. I don't know if there are any special steps that make all this automagicly, this is what i did yesterday on my new Lion in VM Workstation 8 and the latest downloaded XCode from the web.
And like someone above said i also downloaded the command line tools in the weird iTunes line interface.
Could someone write a simple guide on how to change that toolbar so that it has a build button, and how to get the Release build to appear as a normal app in a specified place, do i need some post build script to copy the result, otherwise it builds the app with some weird names, i really can't get around that new Xcode program.