My first exposure to Radical Honesty was Scott Westerfeld's book Extras, in which one of the characters actually had surgery performed on his brain that forced him to practice Radical Honesty (although Radical Honesty comes up in both Extras and Lie to Me, I haven't added Lie to Me as a watch-alike for Extras, because the two have little in common besides that). I hadn't actually thought Radical Honesty was something that real people did - I mean, lies do sometime have a purpose, they're not all bad. I could never see practicing Radical Honesty myself, and I don't really see how it can't hurt a person's relationships just as much as telling lies all the time, but it's still a fascinating idea.
More about Radical Honesty:
- "I Think You're Fat" by A.J. Jacobs (article, Esquire)
- Radical Honesty - The movement's offical website. This site would probably be much more interesting if more of it were working.