We need to get wordpress to write to your SMF database when you publish a new post.
It looks like Wordpress provides "hooks" as part of their API, here:
Plugin API « WordPress Codex
And here is a comprehensive list of action functions:
WordPress 2.x Hooks for Action - Comprehensive List for Plugin and Theme Developers
Let me review these for a few and we'll see what we can figure out..
You are using Wordpress version 2.x right?