[mileswu]

CERN still uses AFS extensively for all users' files. I believe they use a forked version of OpenAFS. My experience with it at CERN has been okay. It's been fine to use locally, but transatlantic over the Internet can be very slow (it does work eventually though).

I'm not sure if there are any alternatives that work any better over long distance. I suppose CERN also has CVMFS [1], which is a read-only caching filesystem that retrieves the files from upstream via HTTP. This works much better, but it is read-only so only satisfies certain use cases.

[1] http://cernvm.cern.ch/portal/filesystem