I'm kind of in the same boat. There are plenty of resources for learning Clojure, but I haven't found any that help with the transition from object oriented programming to functional programming. I read Programming Clojure and I feel like I know the language, but I'm still working on thinking in terms of functional programming. Interestingly, Programming in Scala has helped some. The hybrid functional/object oriented approach has helped introduce functional concepts with a language that doesn't seem so foreign. It can be difficult to pick up a completely different language (different from C-like languages, anyway) as well as a new programming model at the same time. JavaScript: The Good Parts is also good for the same reason.

There's also an F#/C# book scheduled to come out later this year that looks like it might be good for learning the functional thought process: http://www.amazon.com/Functional-Programming-Real-World-Exam...

I found this blog post from Stuart Halloway to be informative as well: http://blog.thinkrelevance.com/2008/9/25/pcl-clojure-chapter...