Corporate ID Typography
Possibly a useful starting point for a classroom lesson on typography and design: TypoWiki has a pretty extensive list of fonts used in corporate identities, including not only Apple's reliance on a slightly customized version of Garamond in display ads and packaging but also their use of Myriand and Motter Tektura communications. Amtrak leans towards Fruitger; Estee Lauder uses Optima. (I think the wiki's in German, but the basic font and corporation names don't need translation.)