[mrweasel]

Yes and no, if you're in the market for an S3 clone, but want to be able to add features, fix bug or hack on it in some way, it nice to know which language it's being developed in.

As you can tell from the other comments, there's plenty of alternatives to pick from, and if you're going to dive in to the code yourself the language may be a deciding factors.

[unboxed_type]

It is important, because you will not find any Go-developers on the market, so if you are serious about using it then think twice ;)