He didn't know about my blog, like apparently you do if you're reading this. Nevertheless, here's the answer I gave him.
You should go read all eight Insight and Outlook columns; the latest is "Why and how IBM architects became architects." I talk about architecture a fair bit on my developerWorks blog, WebSphere SOA and J2EE in Practice. I don't have a specific architect/architecture thread, but if you search on words like architect, you'll find lots of postings. For example, one is Becoming an Architect, which points to the IT Architecture page on my wiki. I've also written the New to Architecture article for the Architecture zone. So that's where you can start learning about architecture, at least what I think.
So maybe that's a helpful overview for some of you as well.