Liferay's architecture is pretty lean, but there are lots of things to learn about it. What would you be interested in learning?

I'm doing a talk next week in Liferay's DevCon in Berlin about Advanced Liferay Architecture. I will also deliver it at the Spain Symposium and the North America Symposium. This presentation will be a follow up of last year's presentation about Liferay's Architecture and the blog series that I have been doing here. Here are the topics that I have in the presentation so far:

• Caching
• Request Handling
• Plugin Architecture
• Message Bus
• Asynchronous invocation

Which of these topics is more interesting for you? What other topics would you like me to speak about?

Also, if you can't attend any of the events (and if I were you I would miss them :) send me your feedback as well since I will still write blog entries about these topics.

Please add comments or answer in twitter with your proposals.