I'm taking a stab at composable streams, starting with cursors. I managed to make a derived cursor today -- as I work through this stuff, I hope to understand Iteratee/Enumerator better. -- Jason Dusek http://github.com/jsnx/streams/tree/554dd69339f027f113a6cfa16f552727ba9d92b3/Control/Stream/OneWay.hs