Formats available for viewing:
PDF suffers from the problem that the fonts used by LaTeX for equations are not among the fonts that Acrobat knows, and therefore must be rasterized. This means that bitmaps of those fonts are created for a specific target resolution. If you happen to zoom to just the right degree, then you'll hit that resolution and everything will look good. Unfortunately most of the time you'll be looking at the file at some different resolution, and equations may look poor.
Sometimes Acrobat Reader 4.05c (latest as of March 22nd) has trouble displaying the file when run inside Internet Explorer. Saving the file to disk, then viewing with the standalone reader seems to help.
Postscript has a similar problem as PDF. Results will look
great when printed, but will probably look poor in
DVI might not show charts, but at least the equations will look good.