I spotted this project from Koichi Nakamura
A mother board approach to a Pi Zero cluster
Yes Andy stick 30++ PI Zeros which are either unobtainium or £30 ea from Cool components then stick them in an expensive carrier board then you too can have a cluster with the same compute power of an 5 year old Atom CPU 
Nice toy but Clusters of RPIs are a joke and merely noise to stop us looking at any number of much better boards out there!
Or have a 'Zero amnesty. Because maybe a whole load that were purchased are lying unused!
Mine is unused but (like many others perhaps) it is there for a "rainy day" - not really for any educational use.
(despite the amount of rainy days here.. wonder when I will finally use it.
My zero is being used to make a small robot and a private roadtest
Hi Andy,
I think we're the exception though. If there were ten thousand Pi Zero's sold and being used, maybe there would be more noise - instead the projects I'm seeing reported on the Internet are by people we know, standing out of the noise. I don't know 10 thousand people : ) probably the Zero's are thinly spread since most people can't purchase more than one or two at a time.
For example, this recent post shows about 10 interesting Pi Zero projects: https://www.raspberrypi.org/blog/pi-zero-projects/
Yet of the 10, I have heard of some of these people : ) especially Frederick's amazing projects! And the last one on that list was by a store (ModMyPi) so they have a vested interest to create content.
I get that not everyone blogs, but by the law of averages with (say) 10k sold (I have no idea - this is a stab in the dark) we should have seen a _lot_ more from the noise on that list of 10 projects.