Cloud Save for Google Chrome sends files from the Web to your online storage
Install Cloud Save, and you'll add the ability to right-click files on Web pages you visit and zap (or sideload) them to various online services like Google Docs, Dropbox, Picasa, Flickr, Posterous, CloudApp, and Box.Net. The extension appears to be based on drag2up, another handy little Chrome extension, as you'll see some of the auth dialogs refer to it instead of Cloud Save.
By default, Cloud Save shows you desktop notifications when a transfer completes -- though you can shut them off if you like. It's a handy extension for zapping found files to your cloud storage without having to download them to your desktop first.