This is easily the best of the BFI film guides I have read. The author, Bryony Dixon, writes in a bright, enthusiastic style that welcomes the viewer into the world of silent film. She makes the point that silent film, instead of being "broken" or "incomplete," is instead more akin to opera or television than the conventional feature film of the talkie era.
While she covers the familiar landmarks of the silent era, such as "The Gold Rush," "Battleship Potemkin," and "Metropolis" among others (making fresh points on each), she also covers many non-feature films of the silent era, such as serials, short comedies, newsreels. As she notes, with youtube, many of these rare films (such as a film showing the trenches in France just after WWI as filmed from a blimp) are more available now than they have been for decades.
Even if you consider yourself fairly well-informed on the silent cinema, you will learn something new in "100 Silent Films." It is strongly recommended for anyone interested in movies.