One interesting text I have not yet seen referenced is: "Functional Programming", by A. Field & P. Harrison, Addison-Wesley, 1988 ISBN 0-201-19249-7. It is heavy into Hope, conbinators, and graph reduction and has chapters on Memoization, Garbage Collection {one of the few good gc write-ups I have seen in a text}, abstract interpretation, etc. -Ken Dickey