> Now, here's a question: How similar is Go to Sean Dorward's Limbo? If we put them side-by-side how many similarities would we see? If no one answers, I may just do this myself. I think it would be interesting.

Quite a few, and you might note that Sean Dorward is now also at Google working on Spanner.

And for details on Limbo, see this paper by Dennis Ritchie: http://doc.cat-v.org/inferno/4th_edition/limbo_language/limb... and this one by Kernighan: http://doc.cat-v.org/inferno/4th_edition/limbo_language/desc...

And as others pointed out, is also worth checking Alef: http://doc.cat-v.org/plan_9/2nd_edition/papers/alef/