I’ve been having a look at Teamspace Collaborative Software (their online demo) and got some conclussions about simple user interfaces. I think it has a good one. ILIAS could get some ideas from it, as it is just another collaborative work tool, focused on e-learning.
– Have a look a the forum discussions, how pretty well organized they are… similar to ILIAS, but even easier.
– There are NO frames at all within the platform.
– There are (almost) no tables (or the CSS hide them pretty well).
– The learning curve for the software: you learn it almost by mouse clicks. Nice.
– The calendar is full of colors, much more attractive to users.