> Did I accidentally build -current?

No.

> In my persuit of OSS I made to rebuild my kernel. I was rather
> expecting 1.6.1_STABLE but got NetBSD 1.6.2_RC4 instead. I know
> I did not run build.sh to get it.
> 
> It does seem to work fine so far. But what is it? ...

Release Candidate 4 for the future NetBSD 1.6.2 release.

> ... And is that okay?

I'm sure everybody is hoping so.  What's your opinion?
====================
To retrieive latest 1.6 (now 1.6.2 RC4) do:

cd /usr/src
cvs update -r netbsd-1-6 -dP
====================
To retrieive the latest 1.6.1 do:

cd /usr/src
cvs update -r netbsd-1-6-PATCH001 -dP
====================
To retrieive the latest -current do:

cd /usr/src
cvs update -A -dP
====================
Have fun.