As a Dreamhost hosting customer, I'm rather pleased to see they are involved in Ceph filesystem development (via their co-founder) and are apparently <a href="http://www.dreamhost.com/jobs.html">hiring Ceph developers</a>.
On a more prosaic note: not sure if Ceph addresses this, but anything that can fix the multi-hour fsck's required (for shared hosting and VPS providers on ext3) after a power cut would be very beneficial.