drag2up is browser extension for Chrome and Firefox that enable uploads to any website by simply dragging and dropping the file from your computer onto the respective site all in the background.
Instead of opening a new tab, browsing, pressing "Open", then hitting submit button -- drag2up streamlines the process into a single, swift gesture where you drag the file onto the text entry field. The link is instantly added while the file is being uploaded in the background. If someone navigates to the link before it's done uploading, the page uses the Google App Engine Channel API to stream real time upload status.
drag2up currently supports imgur, imm.io, ImageShack, Flickr, Picasa, gist, pastebin, mysticpaste, Chemical Servers, DAFK, Hotfile, Dropbox, CloudApp, and built in URL shorteners.