I'll be writing a bunch of snippets for you guys to use as you please. I'm sure you will find a lot of use with them for making games, and probably other stuff too.
I'll keep this list updated when I think of more stuff to put in it. And I'm open to suggestions, if you have any, you can contact me via @SlashGame on twitter (By the way, I'm more likely to see a mention than a Private Message).
Draw Image with Rotation
Draw Text to Canvas
Play Sound (HTML5 Audio)