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Google is moving to ext4 in production. They've done some testing and found jfs as good, but ext4 as easier to upgrade.
Link to a post by what appears to be a Google employee discussing this:
I would still be wary of ext4 for the moment for a production server, its reputation and novelty remain stumbling blocks to adoption. Give it another year or two to mature, and we'll see if stories regarding its tendency to lose data is undeserved. If ext3 works, then why jump too fast?
That proves encyclo's point: they are far more interested in performance than data integrity at the file system level because they get data integrity at the GFS level.
I intend to stick to ext3 for a while, and then may not move to ext4 - someone is working on ZFS on Linux (via FUSE), then thre is BTRFS. IN a few years we might be all using flash drives and there are specialist file systems to get the best performance out of those.