You probably saw the recent Google blog post about sunsetting different products. http://googleblog.blogspot.com/2011/11/more-spring-cleaning-out-of-season.html
Here it is in short: (Remember, this is my personal blog and doesn't represent Google official thoughts, policy or inclinations...)
1. Google Bookmark Lists (Dec 19, 2011) -- essentially nobody was using them (I mean, not even I was using them, so you know it didn't have much uptake). Fatal flaw--what user problem was it solving? Nobody really knows, so it's going away in December.
2. Google Friend Connect (Mar 21, 2012) -- being superceded by Google+ features.
3. Google Gears (Dec 1, 2011) -- it was a valiant attempt to make Google products work offline as well as online. But with the advent of HTML 5 (and the various offline features it offers), Gears is rapidly becoming redundant.
4. Search Timeline (Oct, 2011) -- this is unfortunate, as there really isn't anything else quite like it. Yes, you can use Google Insights for some of this function, but the ability to do Timelines over News Archives is just gone. I'm hunting around for a good replacement for the ability to do this kind of search + charting.
5. Google Wave (Mar 30, 2012) -- I can't say that I'm sorry about this one being turned down. In my use of Wave, it was just a giant, unwieldy thing. Nice idea... but it was too much all in one package. I want a speedboat, but got a cruise ship.
6. Google Knol (Oct 1, 2012) -- This too was a great idea--authored Wikipedia style articles. But it never took off in the way that Wikipedia has, partly because the articles never got enough links to make them show up high in the results. Sigh. Unfortunately, Wikipedia is suffering its own set of difficulties. (Have you tried to add a new article to Wikipedia recently? See Danny Sullivan's recent rant about this. He's totally right. His critique shows the growing problems that Wikipedia is having, and worries me about its future.)
Moral of this particular story: As I've been saying for a while, things come, things go. The good news here is that Google is getting better about letting everyone know about these changes. You can see the culture change over time. Used to be that changes just happened without any kind of comment. People noticed, or they didn't.
Another kind of change that went unremarked (but I'll tell you) was that there were recently a bunch of changes to the online Dictionary. When you do the [define: