Go has a bunch of good stuff surrounding SQL. I haven't used MySQL, personally, so I can't comment on which MySQL driver is best, but I know YouTube uses Go for something related to MySQL, though I can't say for certain exactly what. http://code.google.com/p/vitess
The goauth2 (http://code.google.com/p/goauth2) library is written by Brad Fitzpatrick and Andrew Gerrand (two members of the Go team), and is stable.
Logging is great. Interfaces make it really, really flexible. I'm not sure what you mean by tracing. Stacktraces? Those are easy to retrieve: http://golang.org/pkg/runtime/debug/#Stack