This IBM web site has information about RPG enhancements and other RPG-related topics.
Navigator for i – new version – provides a comprehensive set of system management features for IBM i.
This article reviews the hidden gems in the latest OS release, including several security-related enhancements.
The Request for Enhancement (RFE) page allows you to submit requests, review requests submitted by others, and to vote for those RFEs important to you. An IBM ID is required to log into the site.
This link takes you to the web page for the IBM Power Systems Technical Webinars. You can find information about upcoming webinars as well as replays for past sessions. This is a great resource to keep current on the latest technical topics. The webinars are informal and have a focus on how-to, how-it-works, best practice, and hints and tips.