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Mind the Gap: Reconnecting Architecture and OS Research is a paper presented at HotOS XIII, the place where researchers talk about making potential futures happen. For a great overview of the conference take a look at this article by Matt Welsh: Conference report: HotOS 2011 in Napa.
In the VM/cloud age I question the need of having an OS at all, programs can compile directly against "raw" hardware, but the paper does a good job of trying to figure out the new roll operating systems can play in the future. We've been in a long OS holding pattern, so long that we've seen the rise of PaaS vendors skipping the OS level abstraction completely, but there's room for a middle ground between legacy time sharing systems of the past and service level APIs that are but one possible future.
Introduction: