Microsoft Have Done A Wonderful Thing*
As the title implies, the theme of Feynman’s lectures was rather broad, with him giving an overview of many key physical principles, how they were arrived at, and what they mean in real terms.
I don’t think any summary or further description would serve any real purpose, but suffice it to say, if you’re into (or even vaguely curious about) physics and how we understand the world around us, there are few better people to explain it.
Oh and you’ll need Silverlight, annoyingly, but if ever there was a reason to install it, this would be it.
*Well, they did a wonderful thing back in July, but I’ve been busy, K? K.