Right. I'm waiting on a 2.6GHz i7 with 1TB internal HDD to which I'm adding RAM (to 16GB) and an internal 256GB SSD. I'd planned on keeping the SSD as a separate drive on which I'd put the OS, Apps other things like my Lightroom catalogs and Aperture libraries (as you do). Images will be stored on an external FW800 drive. But what if I partitioned the SSD into two 128GB drives and used the ML Core Storage facility to create a fusion drive as well? I've read a lot about the advantages of letting the OS shift data around to optimise performance in FDs. [EDIT in light of comment below - fuse SSD partition with HDD]. So, doable? A disaster waiting to happen? Worthwhile? A complete waste of time? What does the panel think?