Hi. If you are not aware, users on anandtech's storage forums have found a bios modification that enables trim for raid-0 platforms that previously were not supported by intel. Its a fairly interesting thread but trim has been documented to be working on h55, p67, and z68 systems so far by several users. It confirms what was previously surmised by several reviewers that there is no logical reason that these platforms could not support trim in Raid-o outside of intel wanting to make everyone upgrade to new stuff and not wanting to do validation testing.
Cheers.