LEGO.com got a new Power Functions section at the products webpage.
There you may find lots of information about the LPF elements, from respective Bios with feature descriptions, FAQs, to a Gallery with users constructions.
Also there you will find, lots of movies explaining the PF system, how the several elements work, interconnect and some LEGO Designers explaining how to integrate the PF elements into real LEGO models.
Below, one example where Alfred integrates a dew PF elements into the 8295 Telescopic Handler.
Everything well organized and prepared to receive any new upcoming LPF elements, once they get released.