(Mostly) Functional Design?

[Kyle Consalus <consalus@gmail.com>]

There are a wealth of resources related to object oriented design techniques
(which can certainly be applied to OCaml), but I've been pretty much unable
to find any good resources on large scale design of functional programs.
I realize that this is the sort of thing that develops over time with
experience.
Just the same, there is (most likely) a lot to learn and consider, and a 
resource would be helpful. My recent uses of OCaml for fairly small projects
have been effective, but a lot of things were cumbersome in the design
and I suspect that I may be thinking about it wrong.
So, could anyone suggest a good resource or perhaps weigh
in on their thoughts on the topic?

Thanks,

Kyle