A personal take (or rather two) on Shaw's wit and personality by the President of the National Academy of Performing Arts. Available HERE and HERE.
The British Library has recently made available lots of materials by and about several different authors as part of their project "Discovering Literature: 20th Century." Go to their HOMEPAGE and introduce the terms "Bernard Shaw" in the search box on the top-right corner. You can also navigate the different sections - there are items belonging to Virginia Woolf, George Orwell, and many others.