"what is really required is a file system that can map across both SSD & HDD partitions and place files according to appropriate access patterns."
I think it won't be long now before we start seeing disk migration utilities that act something like meta-defragmenters. They'll do exactly what you describe: examine your access patterns and migrate frequently-accessed files to the SSD, others to HDD, and possibly even create burn groups so you can archive unused files to DVD.
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@Steven Jones
"what is really required is a file system that can map across both SSD & HDD partitions and place files according to appropriate access patterns."
I think it won't be long now before we start seeing disk migration utilities that act something like meta-defragmenters. They'll do exactly what you describe: examine your access patterns and migrate frequently-accessed files to the SSD, others to HDD, and possibly even create burn groups so you can archive unused files to DVD.