Starting today, I am running continuous builders for Go on NetBSD/386 and NetBSD/amd64. Both are running fine, so Go is now (semi-officially) supported on NetBSD. You need at least version 5.99.51 or, even better, a NetBSD-6.0 release candidate. In addition, the latest Go release (1.0.3) does not have the NetBSD support, so you must build from source on tip.
Go 1.1, which is expected for January 2013, will support NetBSD on x86 officially.