Some of his lesser knowm work:
Vectora. Has a high x height, giving it a unique and refined look.
Meridien. I used Meridien once for a high class travel magazine I was designing. The typeface worked equally well for body copy, and the italics were interesting enough to work well as headlines.
I would have to say that Frutiger got me started on type design; I was working on a poster for a class that required that we choose a typefaces and only use elements from that typeface when designing. Initially, I struggled with the project, but eventually hit on the idea to use the U forms to frame the main piece. The center is a motion blur abstract also based on one of the characters. Although I was just starting as a designer, five years and an undergrad and masters degree later, I am still proud of the result. It probably has more to do with the quality of the typeface than any actual skill.