Max Cowan shares some of his memories of Penrith on his website 365 Short Memories.

Penrith Library has a website called Penrith City Local History.

A more contemporary blog is Living next door to Sydney

The Nepean District Historical Society looks at Penrith from its earliest days to the present.

Facebook groups

There are some interesting Facebook groups too.

Penrith High School when it was truly selective 

Memories of Penrith and surrounding suburbs

burbs

Penrith and the Nepean Valley History and Memories