pdhpe.net is a free online "textbook". It provides the content for the HSC PDHPE course, and more recently has added the 2 Cores for Preliminary PDHPE. The aim of the site is to help students succeed in PDHPE by providing up-to-date content, as well as many other study tips and examples of applied content.
This site has over 100 articles written by an experienced PDHPE teacher that aim to help improve your study techniques and provide you with example HSC exam answers, and much content often used by teachers as assessment tasks.
This site also has a small shop that sells electronic products. These include HSC PDHPE summaries and flashcards (in pdf form ready to print) as well as some audio content that can be downloaded and put onto an iPhone.
pdhpe.net is constantly being developed and up-dated, with the most recent addition being the content for Core 1 and 2 of the Preliminary PDHPE course.
This site also has a youtube channel, a Facebook page, a Twitter account, it is even on Pinterest. I encourage you to like and follow first the Facebook page, as this is where I hold competitions and share my information first.
If you want to remain up-to-date on what is happening I highly recommend you subscribe to the email list (don't worry i don't share your information and only send you emails about new content, and possibly the occasional sale when it is on).