On MacOS X Mountain Lion, VoiceOver 6 reads "Breadcrumbs with 3 items, navigation. Link, Home. Link, Library. Visited link, Data."
On Windows XP, Windows Eyes 184.108.40.206 reads "Two links. Link, Home. Link, Library. Visited Link, Data."
On Windows XP, NVDA 2012.3 reads "Navigation landmark. Link, Home. Link, Library. Visited Link, Data."
The ARIA hidden attribute is used to prevent screen readers from reading the peripheral dividing bar as meaningful content.
Authors MAY, with caution, use aria-hidden to hide visibly rendered content from assistive technologies only if the act of hiding this content is intended to improve the experience for users of assistive technologies by removing redundant or extraneous content. w3c.org