I've gotten a few requests lately about using this to desalinate saltwater. In my many travels around the web I ran into this the other day, so I thought I'd share. It's talking about a paper just published this year, and it may point to something we want to try.
I found the entire paper and I'm still going through it to see what we can glean from it, but it looks promising so far.
I'll add the link to Links bar of this project, but I thought I'd point it out for those who are interested in that sort of thing. I know I am! :)