Ok, this one is not that new, and it is not that revolutionary, but it does make my life easier. In Mac OS 10.3 and higher, this app runs on your computer. It allows you to drag and drop images from your desktop or iPhoto alike. On import, it will ask you if you would like to resize the images, batch convert them, add names descriptions and tags and after you are done uploading…it will even tell you how much bandwidth you have used (in accordance with your limit) for the month.
Get it (and others for PC and MAC) at the Flickr Website. It saves you tons of time from manually uploading the images through the browser upload tool.