- Use a palette with wit -- use typefaces with complimentary moods to evoke an energetic air
- Use a palette with energy -- mix typefaces from the same historical period whose families have different features
- Use a palette with poise -- mix typefaces with similar line quality if they offer different textures
- Use a palette with dignity -- mix typefaces with similar proportions and give each a different role
To see stuff in motion, check out the new roundup on AETuts by Topher Welsh, 25 Amazing Typography Videos, and part of series of round-ups by Motion Design Love, Nice Type Tuesday 10.
UPDATE: in late 2014 Lynda.com featured Foundations of Typography: Choosing and Combining Typefaces