CheesyPeas
You already have a drag drop that is very nifty, but I would like to see a shell extension for explorer, etc. What you would do is right click on the file then you'd get a Send Via SmartFTP entry with an arrow next to it, with a menu of your favourites. Pick your favourite and Smart FTP will connect to the server in the background (or open and connect) and return a modal dialog with a list of directories on that site (defaulting to the last selected directory on that favourite). Click the folder and it'll send directly.