[R] Pretty onscreen plots?

[Falcon, Seth]

I'm looking for ideas for creating high-quality plots for use in projected
presentations (powerpoint, etc) --- ideally high-quality png, jpg, bmp.

The graphics produced using the postscript device look very good.  Those
generated with win.graph(), png are plagued by the jaggy lines.

So far, the only way I can use the postscript plots in my presentations is
using separate screen capture software.  Can someone suggest a better way?

Thanks,

+ seth