I've been working on some slide decks that have mathematical notation in addition to graphics and narrative, and I've been somewhat at a loss for a mechanism to bridge the gap between the TeX world and Keynote.It's much easier to get thisby doing this\[\overline{world}\,hello.\mathbf{0}\]than it is to draw it in OmniGraffle...But, there is a way to make this work well and look good. For a document rendered with PDFTeX (or, in my case, PDFLaTeX), you can cut and paste a PDF fragment straight from Preview into Keynote! At least with the correct fonts installed, the result scales smoothly and looks great.