I've got an Intel 80M in my dev machine (ubuntu 10.04), running a pile of KVM virtual machines. I've got it split, 40gig to / and 40 gig to flashcache for (a large partition on( the 1TB drive that I'm using for bulk storage. It screams. It can start 6 vms in a couple of seconds, with 250+ meg random read speeds while all 6 are starting up. I've tested with flashcache off, and It's a good 4x slower.

I'm starting to cycle these SSDs into production, got a couple coming Real Soon Now as vm containers. DBs are next, I just need to decide if I'm going to use flashcache or buy enough to go raid.