Do you ever wonder what all the different IDS editions mean? Developer, Express, Workgroup, Enterprise? and how about those licensing models, VU, Authorized User, Concurrent Session? I don't have a clue, but Carlton Doe cuts a swathe through this complexity in his recently published developerWorks article Compare the Informix Dynamic Server Version 11 editions - Learn the differences in features, functions, and pricing models.
If you haven't figured out which edition and license model you need, Carlton's article, written with his usual passion for Informix, might be what you need.
Server Studio JE
Another developerWorks article that appeared this year (I should check that site more often), is Using Server Studio JE with Informix Dynamic Server by Dhanshri Kudgavkar and Prasanna Mathada, two engineers from the Interoperability Team in India. It's a getting started guide to the Java based Informix development and administration environment from AGS, which takes you through connecting, managing databases, routines, and other database objects. It goes through the major features and covers a few administration tasks, with screenshots.