Sounds like the next version of Sony Reader will support the IDPF open ebook standard. I like reading ebooks from dedicated readers, but I hate the hoops I have to jump through to get them on there. Sounds like a step in the right direction.
Ronald Huereca disects the “Better Comments Manager” WordPress plugin, in what is hopefully the first of a series of articles of this type. Should be a great place to start if you’re trying to figure out how WordPress plugins work.