You may find this hard to believe, but some analysts content that email newsletters are still among the most preferred methods of "information awareness" by developers today. And in our experience, the numbers back it up: subscriptions to Oracle Technology Network newsletters grow organically by 15% every year, even after you take continual list cleanup into account.
At this point, we have honed our newsletter strategy to a fine edge; the choices are now:
Oracle's Java Developer Newsletter
Oracle's Database Application Developer Newsletter (also suitable for DBAs)
Oracle's Architect Community Newsletter
Oracle's Solaris Community Newsletter (new!)
Oracle's .NET Developer Newsletter
All of which you can subscribe to here; sample issues also available.
Have a taste, you'll like them!