Lambda the Ultimate

User level transactional programming in Haskell, Peter Thiemann, 2006 Haskell Workshop.

Correct handling of concurrently accessed external resources is a demanding problem in programming. The standard approaches rely on database transactions or concurrency mechanisms like locks. The paper considers two such resources, global variables and databases, and defines transactional APIs for them in Haskell. The APIs provide a novel flavor of user-level transactions which are particularly suitable in the context of web-based systems. This suitability is demonstrated by providing a second implementation in the context of WASH, a Haskell-based Web programming system. The underlying implementation framework works for both kinds of resources and can serve as a blueprint for further implementations of user-level transactions. The Haskell type system provides an encapsulation of the transactional scope that avoids unintended breakage of the transactional guarantees.

I thought this was an interesting paper because it gives a concrete example of a case where you want transactions, but positively don't want the full suite of ACID properties. Maybe it's not so surprising to those hardcore software architects in our audience who go to sleep with Jim Gray and Andreas Reuter's book under their pillows, though. :)