Came to know about it sometime ago, they seem to have released the source code too.
People at a company in my locality used it for internal communications, heard from them that they would need to rollback.
While in personal life I never found it useful, besides the beta was unreliable, a text file attached to one of the waves became unrecoverable after 1 month.
Shame really, Wave had some real potential to evolve the IM / Email market, unfortunately they marketed it poorly and thus everyone got confused and gave up.
Not many people could actually find a good use for it. Every time someone I knew tried it, I got the reaction that they thought it was cool, but then couldn’t really progress from there.
Beta’s are never stable. I thought that it might become useful as HTML5 become in popular use. I read somewhere than you could like websites to Waves, and have live edits on the go. So it’s uses would have been really good.
I assume it came out under the GPL license, so people will be contributing left, right and center. Maybe this was Google’s plan. I thought the code was released anyway.
I don’t think this would be the end of Google Wave. On the contrary, I think this might be the beginning of something which we have something yet to see.