I am thrilled to announce the first release of the BIP110 activation client (link below). By running this code, you are actively protecting Bitcoin's usefulness and soundness as money. A huge thanks to our hundreds of contributors and supporters who have brought us this far.

"Don't break userspace", while a nice idea, is not applicable to Bitcoin, if "userspace" means "stuffing blocks with arbitrary data". @GrassFedBitcoin puts it very well here: