"Push it real good", Aerogear is here with its new UnifiedPush Server and SimplePush Server. Mobile application developers have historically had to rely on relatively expensive hosted solutions for sending push notifications to APNs (Apple Push Notification service) and GCM (Google Cloud Messaging). Now there is a open source Java solution for sending native push notifications from your server to iOS and Android devices.
Download the server, read through the documentation, check out the sources on github and visit the Aerogear team on IRC at #aerogear irc.freenode.net
Hijack JGroups - Bela Ban is back with a great blog on getting into the weeds with the JGroups in Infinispan and Wildfly.
OpenStack - Shane Johnson explores OpenStack - a middleware developer's view of the IaaS world.