Five Principles for Choosing and Using Typefaces
smashingmagazine.com
smashingmagazine.com
This seems like an article for new designers, so I'll go ahead and chime in that I think the single most crucial thing you can do when choosing a typeface or making any other design decision is to be able to look beyond what you intended and see into what is actually conveyed. Once you've learned this skill, you'll no longer make dumb mistakes like trying to grab the audience's attention with the 30pt bright red candy cane font. Because doing that usually doesn't communicate "This is worthy of your attention". It communicates "The designer is desperate for your attention", and that's a surefire way to be ignored. So the chief rule is to put yourself into the audience's shoes, and make sure your design decisions don't topple under an (automatic, subconcious) examination of your motives.
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I had similar article outlined - waiting to be written too. But this was really good!
Edit: This was Vitaly, so changed language addressing him.
So one type, plus its italic form, is enough for most of your need. Two types and you can rule the world.
In-fact, you have 'letter-spacing' and 'text-transform' with CSS. That in itself is enough to create so many variations of same type.
http://www.fontshop.com/education/pdf/fsfinalbook_spread.pdf
Got it from http://www.fontshop.com/education/
And that's what Vignelli meant in the film.