Lost interest when saw you have to implement your API in PHP... doesn't gel well with the interoperable web service vision of the future.
If you could implement the API in any language, then you'd really be talking.
Maybe that's the next step. This idea has incredibly powerful implications - imagine if Adobe let you do simple filters and previews from an API call. Lots of cool possibilities.
Always worrying when someones working on a similar thing to you. Or validating..
Embrace the fear, use it to do something better.
Nice...I'm excited to know more about it!
Why limit yourself with solely PHP? Why not do it with a javascript wrapper which would let you do your own thing in any language?