We're got a (very) basic integration of SIMILE and BlogMatrix going -- you can view it right here. A few notes:

• the "timeline-api.js" depends on being in the HEAD of the document, as it parses the SCRIPT elements in the HEAD to find the location of that file, so it can load dependent scripts. This doesn't really work for us, as we dynamically load scripts in the BODY as we find a need for them. It would be much better if they took an approach like TinyMCE, where an explicit load function is called with parameters (and if the parameters cannot be found, then you start trying to derive them)
• I'm very pleased to see that HTML works in the popups
• We obviously need a way of setting the beginning and end dates of the time, or the resolution, and the height
• You don't need to call a loader to external URI to get the data into the timeline (as the examples use). Just call eventSource.loadJSON(json-object, base-uri) and off you go.