This talk introduces LLVM, giving a brief sense for its library based design. It then dives into Clang to describe the end-user benefits of LLVM compiler technology, finally wrapping up with mentions of Clang Static Analyzer, LLDB, libc++ and the LLVM MC projects.
"LLVM and Clang: Advancing Compiler Technology", Chris Lattner,
FOSDEM 2011: Free and Open Source Developers' European Meeting, Brussels, Belgium, Feb 2011.