I have to say - I'm really shocked there isn't any macintosh support for this product. This is the same issue that Thingworld and other 3D formats have experienced - if you don't make it available to the larger creative community on Macs then the content is crappy and the tool never gets adopted. Big mistake Adobe. However, I am excited to see Atmosphere get a full release. I made several worlds with it on the PC about 9-12 months ago and I thought it was a fun thing to do but not that useful.
Adobe seeks to heighten 3D on Web | CNET News.com: "Adobe Systems released on Wednesday a new 3D graphics program intended to help Web designers create new types of environments.
The program, dubbed Atmosphere, consists of a set design tools for creating 3D Web images. In addition, the company released the free Atmosphere Player for viewing images, either as part of a Web page or in an offline document saved in Adobe's widespread portable document format (PDF)."