All of the innovations in mobile present opportunities for Google and its competitors to best each other, and all present avenues of access for Google and its competitors to reach consumers.

FORBES: Google Antitrust Case Is Built On A Shaky Foundation

Kelley said TruePosition failed to present facts suggesting the competitors agreed in advance to shut it out of the standards-setting process, instead of merely doing so for their own independent reasons.

FORBES: Judge Dismisses TruePosition Case -- With Invitation To Try Again

Purely by being so widely used, products such as Windows, with its customer base of 100m people, present a high barrier against competitors' entry.

ECONOMIST: Beleaguered Microsoft

Time should be spent evaluating what competitors offer and the story they present to buyers.

FORBES: Companies With The Best Stories Win: 10 Key Points For Telling Your Story

Apple wants to own a generation of post-PC world users and block out their competitors until such time as they can present a higher-quality user experience than Apple.

FORBES: Apple Doesn't Have an iPad Strategy, It has a Post-PC Strategy

But even if Wal-Mart is eventually marginalized or defeated, it is likely that another Borg will arise and present some new, seemingly insurmountable, challenge to the world's competitors.

FORBES: Companies, People, Ideas

European carriers can only own 25% of US airlines at present, while US carriers can take 49.9% stakes in their European competitors.

BBC: Second open skies deal signed

Even as massive mapmakers grapple with the problems of how to present the world in ways that serve both educational , commercial and political needs, they are running up against new competitors: individuals.

BBC: The politics of making maps