Who do you think is the most famous person who didn't win from ANTM? I'm only listing models with Wikipedia pages (sorry Melrose fans!) and only some of the models' credits, and trying to pick the most recognizable/prestigious ones.
Elyse Sewell from Cycle 1 has done really high fashion and commercial ads, including Motorola, Vidal Sassoon, Fendi and Chanel and been in magazines like Esquire and Stuff. She's signed with Wilhelmina Models (you can read/see what she's doing at http://elysesewell.livejournal.com/).
YaYa DaCosta (Cycle 2) is a Ford Model who has been in ads for Sephora and Target, and commercials for Radioshack and Garnier Fructis. She was also a star in the Antonio Banderas movie "Take The Lead."
Toccara Jones (Cycle 3) is also with Wilhelmina Models (she's been in New York and Company and Target ads) and she was on the cover of King in spring 2006. She's also a fashion correspondent for BET, and appeared as a contestant on the VH1 show Celebrity Fit Club.
Kim Stolz from Cycle 5 is with Elite Model Managment, and been in ads for American Eagle Outfitters and Nordstrom's. She's also a correspondent for mtvU, and been profiled by the LA Times (http://www.latimes.com/entertainment/news/la-ca-mtvu13aug13,1,746428.story?coll=la-headlines-entnews). She's also modeled for and appeared at many GLBT events.
Joanie Dodds (Cycle 6) is a Ford Model and has been in GQ and ElleGirl magazines. She's been in a commercial for Pepsi, and was a guest on the VH1 show Best Week Ever!.