> If your presentation program forces you to use raster graphics, then I suggest you use another one. LaTeX interoperates with a variety of vector formats such as SVG or PDF. Also some programs (such as Gnuplot or QtiPlot) allow you to export the graph in PGF/TikZ format, making integration with LaTeX trivial.
I had a paper to do for a class and I used circuitmacros[1] to convert from m4[2] to eps and embedded a our circuit diagram right into the PDF as a vector drawing. I'd like to see any presentation editor do that…
[1]There's some tedious work to get the wires laid out right, but once the shape is set, components can be moved around without an issue.
[2]Not the best of languages, but it was an interesting exercise.