Hi,
we blocked tagging in google groups because of a bug in the groups system a while back that caused the whole interface to come to a standstill (this took forever to discover).
We have a mailing list you can register for at the bottom of the website, we send monthly emails.
Our RSS for blog posts is here:
https://www.codenameone.com/feed.xml it should be visible in the site, I use feedly and do get notifications all the time.
Every post we make to the blog is cross posted to @Codename_One,
facebook.com/CodenameOne, linked in etc.
I guess we didn't tag anything as windows which is a bit odd, the tag cloud on the right is hard coded from our choices. Since its mostly me writing the blog posts I'm kind of lazy in tagging and not very imaginative with that.
I'd love to have proper full site search option as an option and have some ideas on how this should work with our current website architecture but its a non-trivial task for which I just don't have the time.