Yeah, Jens is right . I'm so used to calling the breadcrumb navigation, well, breadcrumb navigation. I never paid attention to it. But of course Hans and Gretel's (Hans en Grietje in Dutch) breadcrumbs were eaten by birds so they couldn't find their way home. Poof goes the metaphore :-)
My name is Reinout van Rees and I work a lot with Python (programming language) and Django (website framework). I live in The Netherlands and I'm happily married to Annie van Rees-Kooiman.
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In french we call it the 'Fil d'Ariane' that is refering to:
http://en.wikipedia.org/wiki/Ariadne%27s_thread
'Navigation keys' could be a good name since we are near to introduce the multi keywords navigation ;)