Hi Mark,Having been into interface design for years, and never really found utopia yet, I would not so much look into interface design as interaction design, or how your users work with your software.
An interface can be real nice to look at, but a dog to use. There are some books out there to get ideas from Seeing Data by Rebecca Riordan is an ok start. However, if you really want some brain hurting stuff do a google for some of Edward Tufte's works.
I will close with a recommendation of Alan Coopers organization, appropriately named Cooper. Alan Cooper everyone knows as the father of VB, but he is also a well known author with some excellent titles. His organization works solely in the field of interaction design and publishes a periodic emailer on the subject.
Hope this is of interest.
regards
Geoff