While unlikely to supplant Photoshop, Sumopaint is a surprisingly smooth and powerful image editor. Unlike Photoshop, Sumopaint operates in your browser. Powered by Flash, the program sports many of the same tools as Photoshop. The program also supports layers and filters. The filters are available only if you pay a one-off fee, and for slightly more, users can download an offline app version. The interface is very clean and professional. Now to search for a browser based image editor that runs on html5...