This is just a heads up: Reid Spencer is working up a changeset for LLVM
which will put all of the LLVM classes into an 'llvm' namespace. This
will make it possible to integrate LLVM with other C++ packages that use
classes like 'Type' and 'User'.
This should cause very little impact on the actual source base, other than
the 'namespace llvm' in header files, and a 'using namespace llvm' in the
.cpp files.
If you have questions or concerns, llvmdev is the place for them! 
Thanks Reid!
-Chris