Mindy McAdams teaches university courses about online journalism and the changing ways we use technologies for communication, and she has published a comprehensive guide to multimedia proficiency, now available for download in PDF from her website.
The 42-page document is fully linked and usable online in most web browsers, Adobe Reader, or in Preview on the Mac OS. McAdams has licensed the entire document under the Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License. This means that users are free to share, distribute, reuse and even remix it, in line with the CC conditions.
I have yet to read it in its entirety, but my quick scan of its chapters convinced me that it's a valuable document for those who seek to, not only start incorporating multimedia in their work, but also those of us who already are proficient in it but want to hone their skills.
Via Seshu on Twitter