after killing google reader and buzz I just don't trust them anymore and won't put anything of value into their ecosystem.
they should find a way to just support everything forever even if development is killed.
Do you remember the protests outside of Google offices when they removed that ? One couple even met through reader and got married.
The shared items RSS out was another sad loss. I had set up one client so that he could select news items using that and they would show on his site as industry news. I used it to post stuff to my own site.
Oh, and recommended items basically sucks now and related feeds rarely returns anything. It was like they removed the google magic and left it as just a feed reader.
Also: they didn't kill google reader. And Google+ is not comparable to Buzz. Google is clearly not going to kill that off.
but for anything that is not directly relevant for search and advertising, all bets are off.
this was the unbelievable useful tool to get competitive data (traffic, queries) about other websites. it was not perfect, the data was sometimes months late. but it was good enough to compare websites with each other.
now it's gone. probably it didn't fit into google strategy. probably someone at google decided that "we are not in the business of providing competitive intelligence data of websites" (i guess that, as the google adplanner was stripped of lots of website data in the same timeframe )
the same thing with the product mentioned above. it will be killed. maybe not this year, maybe not next year, but sure as hell sometime.