Flux is a simple extension application for Fennec ( the Mozilla Mobile browser ). It allows you to capture an image from a page ( screenshot ) and to draw on top of the image, then saves the picture to the local filesystem, or you can also upload it to Flickr. Check an uploaded demo image taken from Fennec.
The original app submitted to the Mozilla Mobile challenge was the 0.2 release. Newer releases beings polish work and may offer advanced drawing controls
Fennec Extension - Flux - Snapshot, Draw, and Upload from Marcio Galli on Vimeo.