I see the Babel doco has now been changed (10 hrs ago - any relation to this HN post?) to say I can run Babel against Nimrod 0.9.4 stable instead of needing to build Nimrod from source. This is great news, I was put off by the language's package manager not working against the stable release version. I look forward to giving this a try.
It's great news indeed. It seems I underestimated how many people will be having trouble building babel due to this. Next time I will do my best to make sure that it works with the latest Nimrod release.
I spent a few days solving Rosetta Code tasks and was surprised how easy most were using the existing libraries: http://rosettacode.org/wiki/Category:Nimrod