This talk gives a gentle introduction to LLVM, talking about the benefits of using llvm-gcc and including updated compile-time and run-time performance numbers. This talk is high level and particularly suited for those without a deep compiler hacker background.
"Introduction to the LLVM Compiler System", Chris Lattner,
ACAT 2008: Advanced Computing and Analysis Techniques in Physics Research, Erice, Sicily, Italy, Nov 2008.