It sounds like you were using liquid cooling, did you ever try phase change cooling? Something like this (http://www.youtube.com/watch?v=Z_X_hgtlJpA&t=36)? I saw a demo of it a couple years ago, really cool stuff.
No. Not flexible enough for what we needed to do and, in some ways, limited in performance. For the right applications phase change heat transfer is fantastic.
EDIT: My comment has to do with phase change cooling of the type implemented with sealed copper tubes moving heat from one end to the other using a phase change fluid inside. This full-immersion phase change cooling setup is a something entirely different. I don't know anything about it.
