Boxes and Arrows – The best place to find articles and experts.
IA Institue – If you are at all interested in IA you have to visit this site.
Step Two Designs – Found some very good tutorials here that helped with card sorting and other techniques.
IA One Sheeters – A great idea, these are simple examples to help promote IA within your company. I have used a couple of these and also used them as ideas.
IA Summit – I haven’t been, but would like to check this out in the future.
NN/g – I have attended a NN/g conference and it was an eye opener. Jakob and crew do some great studies. We purchase their Best Intranet reports each year and they are loaded with great ideas and examples of what have worked for others.

The distinction between information architecture and usability may seem like semantics, but there are significant differences between the two disciplines. Though they are often discussed interchangeably, and practitioners are often well-versed in both, information architecture and usability differ in their scope and areas of focus.

The article really focuses on Peter Morville’s thought of “information architecture is a subset of usability, and usability is a subset of information architecture”, which really helped me understand what an IA does and doesn’t do.