What are some shared-disk filesystems people have successfully used with iSCSI?

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http://serverfault.com – The setup looks something like this. The goal is to have multiple computers mount a single LUN from the iSCSI target. Ideally mounting read/write and with ACL support. The servers are running GNU/Linux, so preferably a filesystem available in the vanilla kernel. Though I can deal with compiling third-party modules if necessary. I'm currently looking into GFS2 and OCFS. What are some successful deployments people have done like this? Any gotcha's I should look out for? (HowTos)