If you'd like to try something with LDC2 on x86-64 linux and don't want to go through the hassle of compiling it yourself, grab this: http://www.incasoftware.de/~kamm/ldc/ldc-2.052-snapshot.tbz2
It's a dmd-style extract-and-done package. Be warned, it's not an official release and hasn't been tested beyond a 'Hello World'! Also, the ldc branches of druntime and phobos are lagging significantly behind the upstream branches. The reason this package exists is that I had some hours left over and decided to create packaging scripts for ldc2 in the hope of allowing the current maintainers to make more frequent releases. If you sometimes want to compile LLVM, LDC2, druntime and phobos from scratch without bothering about the details, give this a try: http://www.incasoftware.de/~kamm/ldc/ldc2-buildscripts.tbz2 . (you need libconfig++, it's libconfig++8-dev in Ubuntu) If there's something wrong with the package, please let me know. Bugs in LDC should go to http://www.dsource.org/projects/ldc/newticket .
