mac observer/ars technica mention 3186 as final build http://www.macobserver.com/article/2007/02/27.1.shtml http://arstechnica.com/journals/apple.ars/2007/2/27/7242 Awaiting front page and download links to change [updated to fix typo from 3168 to 3186]
Well let's hope 3186 is GA quality. Given the issues that are present in 3170 I have a hard time believing everything is fixed in just 16 builds I envision Parallels' helpdesk being swamped with costly calls for support.
One man's annoyance is another man's show stopper. It seems reasonable to assume that people don't buy Macs primarily to run Windows. If that one obscure bit of windows software or hardware that doesn't work is the one obscure bit of windows software or hardware that was stopping you getting a Mac, and that Parallels offered the answer to, then game over.