T-Mobile has begun suing several companies in the Netherlands who use Magenta in their corporate identities claiming that it violates their trademark. In response a new social movement has been created to deal with the color's appropriation: Free Magenta.
Something similar happened a few years ago when Orange, a mobile provider in the UK, got litigous with another company using the color orange in their advertisements. It also reminds me of when Warren G sued Garth Brooks for trademark infringement for using the letter "G" in his ads. Pretty ridiculous.(via cpluv)