Google open sourced vitess for scaling out and coordinating (sharding + replication, schema rollouts) mysql databases, it seems they use it internally: http://code.google.com/p/vitess/
P.S. Other organizations using Go: http://go-lang.cat-v.org/organizations-using-go
PS your ps is a great link... Is it complete?
PS your ps is a great link... Is it complete?