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The main difference is that these buttons require no images, while the Zurb ones still require an image. The lack of images makes the buttons highly scalable.

really easy to convert them to linear gradients though...

Agreed. That is their main downside but honestly I haven't had any issues with them setup that way. I've been reusing them for both images big and small and it seems to come out alright.

On Github there's a version of the Zerb buttons that's pure CSS. I haven't tried it in IE, but it looks good on Safari and Firefox: http://github.com/gr2m/awesome-buttons.

I know that article is a little old so it advocates a png, but today Safari, Chrome, IE and Moz all support gradients (albeit each in their own way).

I like these[1] for webkit browsers. I'm using them on http://ihackernews.com for the login and reply buttons.

[1] http://mwhenry.com/blog/2009/11/shiny-css-only-iphone-button...