Here are some sites that deal with similar topics as Beyond the Button that you might want to keep your eye on:
fresh+new(er) - A great blog from the innovators at the Powerhouse Museum in Sydney Australia. They regularly write on the role of technology and new media in museums.
Museum 2.0 - A blog on new philosophies in museum practice from Nina Simon.
New Media Initiatives - A blog from the new media department at the Walker Art Center. They often document specific new ways they are using technology to engage with visitors on modern art.
bloggers at the brooklyn museum of art - The good folks at the brooklyn museum have been some of the most successful in the field with experimenting in colonizing new social spaces on the web.
Beth's Blog: How Nonprofits Can Use Social Media - The title says it all. Great tips for how our sector can innovate in web technology.

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