I found this thread via Tobii email support. I work at the NIH and in my exploration of data manipulation via spatial UIs I came across Tobii. Eventually it seems likely that 2nd wave HMDs will integrate eye tracking (some already are). Manipulating big data sets, displaying complex graphs like those you can generate with d3.js, and moving toward a generally more reactive content experience would all benefit from eye tracking. Development in these areas could begin immediately with js hooks but it seems prohibitive at the moment. It’s a mistake to ignore this segment seeing as how integral eye tracking can be to these broad and high profile applications. Just my thoughts, hope to see the API soon!