It's no different from the SGS (1); physical button flanked by a capacitive button each side, with physical power and volume buttons on the sides.

Pardon, I was actually spouting what Gruber said!

That's ok, the Galaxy was also ripping off of the iPhone.

I've always thought this was something of a joke. An iPhone doesn't have 1 button. It has a power button, two volume buttons, and a home button. Personally I think the 'home' button on the iPhone is unintuitive and confusing and would be glad if Apple did away with it.

The home button is perfectly straightforward to use, as explained in this chart: http://m.flickr.com/#/photos/adurdin/4944720731/