Hay Macfanboy - that is a solid-proof picture on your web site and sure enough that is one cool little button. But I swear it DOES NOT EXIST on the palatte of available choices when pulling down the View Menu and going to Customize Address Bar in Safari 2.0.1. I've looked about it 7 times now, and it's simply not there. I also went to Safari's Help and typed in "Action Button" and all i got was a list of keyboard shortcuts, none of which had anything to do with Action Buttons or shifting Tabs in Safari. If you happen to figure out how to point us to the Action Button in this version of Safari please do post again, thanks!
Safari Improved