Not: Google Wave
Not all of Google's innovations are adopted successfully. Case in point: Google Wave, which we bid adieu to this summer.
Google Wave, a Web app intended for real-time communication and collaboration, just didn't garner the adoption Google hoped it would, it said. Google Wave's site is still being maintained through the end of the year, however they ceased developing it as a standalone product.
[ See also: Google Wave Flops: What Google Service Will Go Next? ]