I was reading through jwz's blog and someone linked to the icon contest winners. I saw Marsh named as the artist who spruced up the animation, so I checked if his company had a website portfolio. The current website wasn't useful, but I checked the archived version and poked around until I saw the Netscape icon page.
https://web.archive.org/web/20011214155044/http://dataglyph....
An older version of the site that attributes the spinning compass (unused icon) to Dataglyph too:
https://web.archive.org/web/19981206034010/http://www.datagl...