VentureVoIP has been keeping the Asterisk community up to date since 2004. We have nearly 3000 articles on a range of topics and have also interviewed a large percentage of the core Asterisk developers.
Tzafrir Cohen from Xorcom has written a post about converting DAHDI-tools to automake.
Jai Rangi from didforsale.com has posted an article on monitoring Asterisk or FreeSwitch from nagios.
Matt Jordan has posted an article about a module for reporting Asterisk server usage back to developers. This would be a great addition because it would show what people are doing with their servers and where development efforts should be directed.
Nir has written a blog post about his take on "Federated VoIP Switching".
Nir Simionovich has written a great blog post on the state of Open Source GUI platforms for VoIP.
Matt Jordan has posted a pretty lengthy writeup on the status of Asterisk 14 to the Developers list.
Josh Colp has create a wiki page to start development of a memory based caching wizard for sorcery.
Flavio E. Goncalves has posted details of the first OpenSIPS Summit for 2015.
Lenz from QueueMetrics has posted details of some Docker images he has created.