To take advantage of many of these resources, you do need to register, but you can register for both communities at once, and the registration is free. To get going with BPX, you may want to check out the "Getting Started" link on the bottom left of the center home page text.
I also have a podcast with Marco ten Vaanholt, the Global Director of the BPX community, on the JonERP.com home page right now. That podcast gets into the skills of the Business Process Expert of the future and also looks at how the SAP BPX community can help you to make skills transitions.
Note that right below this trail mark on the right is a "Business Process Expert General Discussion," and if you scroll further down, there's a "Busines Process Expert eLearning Catalog" to check out, and many of the webcasts are free.
