Many CCNA hopefuls know about the Cisco Prep Center for CCNAs, but unfortunately, quite a few people don't notice the "video on demand" feature found on the website.
http://forums.cisco.com/eforum/servlet/PrepCenter?page=main
If you click the "exam study" tab and look half way down the page, you should notice a "CCNA Videos" section. These are videos made by Cisco professionals, including folks who actually create the tests.
For those that are aware of these valuable resources, you may want to take the time to also watch the CCNP Videos at the CCNP prep center.
http://forums.cisco.com/eforum/servlet/CCNP?page=main
Like the CCNA prep center, if you click the "Exam Study" tab, you will be presented with several videos. Under the title of "CCNP Certification Tips" there's an 11 minute video titled "CCNP Certification Tips" which not only explains how to prepare for the new CCNP requirements, but also how to prepare for Cisco exams as a whole. Even if you have no intention of pursuing the CCNP, please take the time to watch the 11 minute video, because the majority of the information is pertinent to anyone attempting Cisco exams. It offers key insight into the workings of the Cisco exams.