GlassFish 3.1 Adoption - 750k auto-updated and counting!
By alexismp on May 17, 2011
Yes, that's 750,000 (obviously active) instances of GlassFish 3.0.x that were updated to GlassFish 3.1 since the product was released. Anil Gaur, VP of Engineering for GlassFish has a blog entry on this great number.
So as you can see, other than being really convenient for users to update parts or all of their GlassFish installations, the Update Center gives us a great pulse of how the community of users is doing. Also remember that you can run your own in-house repositories and also contribute to the public ones.
What makes this number of in-place upgrades even more interesting is the relatively low number of problems reported against 3.1 (most issues reported are for people coming over from 2.x).