Architecture

I recently posted a question to Stack Overflow. This is a great developer community site run by Jeff Atwood and Joel Spolsky that's currently in private beta. It's a good mixture of discussion forum, Digg-style ratings' site, and wiki that promises to become a truly invaluable resource once development is complete; it's well on its way already! The idea is that ordinary developers post questions and the community responds, with both questions and answers being voted upon by the community.

I've included my question below to gain the issue a bit of extra exposure. If you have a stackoverflow.com account, please visit my question and post a response there, or vote on the question and any existing answers. Alternatively, please leave a comment on this post with your thoughts.

As a follow-up to my previous post on message passing in a plug-in framework, I thought I'd post my solution to the problem. Now that I've finally reached a solution, that is...!

[Note: It would be worth reading the first post to get an idea of what I was trying to do. ]

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I've been running a couple of coding projects at home over the last couple of months, one of which is a personal finance program. I've used this as an experiment in new technologies (mainly .Net 3.0/3.5 stuff, including LINQ and WPF/XAML), as well as one in architecture and design patterns. The program is based around a plug-in architecture and the time has come to consider message-passing between plug-ins; for example, I need non-storage plug-ins to inform storage plug-ins when their data has changed, and what data has changed, so that the storage plug-ins can schedule these changes for serialisation to their storage format (be it an SQLite database, an XML file, or whatever).