Style guide for academic conference talks Is there a comprehensive style guide aimed at academic slideshow-type talks?  Googling has given me random style suggestions from various sources of dubious credibility. Most give obvious information, like opt for effective pictures over text.  Most seem aimed at business presentations, so might compare the virtues of pie charts and bar graphs.  

The issue that sent me finally looking for a style guide is looking for the best practices on "uncovering" information on a slide piecemeal.  Sometimes I do and sometimes I don't, but I've never used a thoughtful decision process.  I would appreciate suggestions about this in particular.

You can, of course, avoid "uncovering" just by putting the uncovered information on its own later slide.  So related to uncovering, I'm also interested in ideas about when two pieces of information should be separated into different slides or when it is best to put them on the same slide. 

If one exists, I'd like a reference made by an organization known for this sort of thing, e.g. something like AP, MLA, a university committee, or an discipline-specific academic organization.  I'm also interested in the general thoughts of practicing academics, whose credibility will be clear from their experience and from upvoting of their answers.
Edward Tufte is classic and well-recognized authority on scientific communication.  His book, "The Visual Display of Quantitative Information" is a wonderful guide for thinking about your visual communication (including slides). He also has a fierce critique of PowerPoint which serves as a good negative guide of pitfalls to avoid.