The website contains currently 82 help topics with 51 screencasts for OpenOffice.org Writer, 3 screencast for OpenOffice.org Impress, one screencast for OpenOffice.org Draw, one screencast for OpenOffice.org Math, 24 screencast for OpenOffice.org Calc, one screencast for OpenOffice.org Base, and 96 glossary terms.The only thing you need to access this website besides browsers are Java Plugin.
Short description about Plan-B from the original site:
Plan-B™ is a new technology that documents software with short videos (screencasts) and offers smart search technology for improved indexing. This service allows anyone, especially non technical users, to find answers to their questions quickly and to understand the documentation effortless.
Here's one of the example which shows you about Find Using Wildcards in Regular Expression.