There is a much expanded second edition of The LaTeX Graphics Companion. It has a chapter on Beamer presentations, which I look forward to reading, even though the Beamer manual is itself a great piece of work. It doesn’t seem to treat PGF and TikZ, which would be my choice, if I had to produce heavy duty graphics.

The book apparently was threatening to burst at the seams, so the two chapters on PostScript fonts and PostScript drivers and tools, updated and expanded with information on TrueType, Opentype fonts, and PDF utilities, are freely available online. A quick look shows some really good information on fonts in LaTeX.