Even the big ones fail.

I love Wave – if only for very few usecases. Sad to see it go, but great to see Google admitting the problem and striking a line.

Wave has not seen the user adoption we would have liked. We don’t plan to continue developing Wave as a standalone product, but we will maintain the site at least through the end of the year and extend the technology for use in other Google projects.

via Official Google Blog: Update on Google Wave.