MinecraftForge/MinecraftForge — pull request #768 by diesieben07 (2013-09-08 17:19:03+00:00)
Title: Added BlockPlace & BlockBreak events

Yes. Yet another PR for them. Not saying this is the holy grail, but I think I've kept the patches quite compact.
Fires on both Client & Server, two events per operation (PRE before the block is changed, this can be canceled and POST after the block is changed).