Cisco Live 365

Cisco Live 365 is an unbelievable resource that’s totally free!  For those who haven’t come across it before – it’s a library of all the presentations from the Cisco Live conferences from the last four years (starting London 2012).  For most of the sessions, the presentation material is available for download in PDF form and for many the actual session has been recorded and hosted as well.
The Library of resources aren’t just there for those who couldn’t make the Cisco Live conferences in person, but provides excellent resources for reference and training materials. I just can’t recommend using enough for those of both Sales and Technical backgrounds.
For those who’re technically focused.. just search ‘Deep Dive’ and you’ll find a mass of material that’s not on cisco.com’s documentation/support pages, most of it’s written by Technical Marketing Engineers or those just live-and-breathe specific technology stacks.