The demo is just an image, he explains further down that he doesn't have a spot to host the demo. The font is easily replaced.

It's just a simple button that clicks down a bit when pushed. It's designed nicely enough with just CSS but I would still prefer using images until CSS3 is more common. There's a simple enough solution to do the same thing using a sprite sheet and CSS2.

It only interacts with the click event and needs to be expanded to include hover as well.

This seems more like an example of how to create the buttons as opposed to a drop-in solution. You would have to edit the css quite a bit to get it to work with your design unless you happen to like the button design offered.

The heading above the images is somewhat misleading:

"Check out what these pushovers look like: Demo"

an interactive demo would be better, the developer should have a look at Github Pages (http://pages.github.com/)

Sorry, I didn't have a place to host it at first, but then a friend told me about github pages, so I actually have a working demo here: http://adrianrodriguez.github.com

Also, the font is just an example, you can use any font you wish.

The demo is actually a static picture :)