Michael Cornwell: Anatomy of a Solid-State Drive
Communications of the ACM, Vol. 55 No. 12, Pages 59-63
Alternative link in case the first is paywalled for people not on a university campus: http://queue.acm.org/detail.cfm?id=2385276
It goes into quite some detail on how SSD storage works on a system level and how it differs from hard disks.