As far as I know llvm-gcc has not been dropped. On Mac OS X it is even installed alongside gcc when you install the developer tools.
Clang is making good progress. From http://clang.llvm.org/index.html:
Clang is considered to be a production quality C and Objective-C compiler when targetting X86-32 and X86-64
Clang is making good progress. From http://clang.llvm.org/index.html: Clang is considered to be a production quality C and Objective-C compiler when targetting X86-32 and X86-64