For some time I have been using FlashCache on my PC at home. Of course I did it the hard way because I wanted it seamlessly integrated at boot time so I could use the cache on my root filesystem.
My hard work seems to have paid off and I have now officially published the fruits of it at http://chrysocome.net/dracut-flashcache
Now CentOS-6 users can get started with FlashCache with (hopefully) a minimum of fuss.
Just as soon as I get time to upgrade my machine at work I will be running it there too.