THE ENCYCLOPEDIA OF TYPEFACES: This catalog-sized book is, as far as I know, the largest hardcopy compendium of typefaces (fonts) available in ready retail form to the amateur. If the "font bug" with its overwhelming choices has bit you, or you enjoy seeing the creative wealth of typefaces that have been developed over most of the last 300 years, this book is going to be both helpful and fun. Not only are relatively obscure typefaces found here, when a font has founded a family (as, say, Goudy, Cheltenham or Caslon Old Face), it can be a thrilling experience to see the many varations that extend from the original -- not only italics and shading, but heavier or lighter leading, condensed or expanded versions, and caps-only (titling) rack-ups.
A couple of caveats: this book appeared in original form in the Fifties, and while this (2009) version is much more up-to-date, do not expect to see typefaces that were created in and for the digital era without hot-leaded antecedents: for example Georgia, Calibri, Ariel and the much-maligned Comic Sans are not to be found here. Also, there is no room for elaborate histories of the creation and acceptance of each font, although there is usually sufficient historical information as to any font's origin, creator, and original ownership. I should note that right now (late Feb. 2012) ENCYCLOPEDIA OF TYPEFACES is quite a bargain.
A nice, up-to-date (if somewhat opinionated) discussion of many typefaces both older and modern in terms of their creation, reception, and customary use can be found in Simon Garfield's JUST MY TYPE, making it a nice companion to this ENCYCLOPEDIA OF TYPEFACES.