How to 'clear refresh' a page display in web browsers (aka. 'hard refresh', ie. ignoring cache)? While doing web development I often need to refresh a site I'm building with the cache ignored. What are the best ways to do this?

I used to use the 'Disable cache' option in Firefox's Web Developer Toolbar. However this disables the cache globally, slowing other sites down, and has the following bug: https://bugzilla.mozilla.org/show_bug.cgi?id=643184

I gather you can do a 'clear refresh' in PC Chrome with ctrl-F5? Is there an equivalent in Mac Chrome, or Firefox for that matter?
For Firefox OS X 3 options:

Force Reload Page (override cache)

Cmd+F5

Cmd+Shift+R

Shift+Reload button

Edit:

Wikipedia has an overview about how to bypass the cache on nearly every browser imaginable.