37signals also announced drag and drop file upload today, for their Campfire app (web-based chat), but it supports Safari in addition to Chrome and Firefox (3.5

37signals also announced drag and drop file upload today, for their Campfire app (web-based chat), but it supports Safari in addition to Chrome and Firefox (3.5, instead of 3.6 as required by Google): http://productblog.37signals.com/products/2010/04/new-in-campfire-drag-and-drop-uploading.html http://productblog.37signals.com/products/2010/04/new-in-cam... Does anyone have an idea as to how 37signals solved it differently, with more browser support?