Progress on ePUB mathematical documents
For months, I've been casting about for tools that will allow me to create mathematical eBook documents in the ePUB format. I chose that format because it's open, supported by the major readers (e.g., Kindle, Nook, iPad software), and can be authored in a way that's very similar to authoring HTML documents.
Here are a couple articles that demystify the ePUB format and show how it is related to HTML: