On Monday our partner Groundwork Open Source, whom are selling a monitoring solutions that they recently certified for Ubuntu, published their statistics of the OS on which they see GWOS running on.

Ubuntu at 14% of their install, second behind the Red-Hat/CentOS/Fedora monster share ? This is yet another vendor that sees Ubuntu growing fast on business servers, and I can't help but feeling good about it.
Comments
Strange thing to put fedora
Strange thing to put fedora and Red hat on the same share, as they aren't the same distribution. uitting Red Hat en CentOS together would be more logicial, altough I'd keep all 3 separate.
Grouping choice
Agreed. Maybe you should tell GWOS about this, as I am just republishing their image and grouping was their choice…
I think that was done
I think that was done specifically to mimic the 2009 eclipse survey. Why eclipse would want to lump them together in a survey however is beyond me. Might as well lump all the Debian and Ubuntu derivatives together too if you are going to do that.
Anyways, general problems with accounting for skew in opt-in usage information aside (you'd be amazed at what political pollsters do to for correction factors when doing sample polling).
Two main questions I have about this graph:
Groupings
I agree – I don't normally group Fedora and RHEL together. I did it in this case to match the buckets the Eclipse survey used (as summarized here http://www.infoworld.com/…-servers-646 ) . Fedora is a small part of the segment – I have more granular stats too.