There are a few different applications that will help you uplod your images to Flickr, but this might be my favorite of all.
Gleam has an easy and attractive interface. You can drag and drop the images or select the folder in your Finder window. Once they are in the app, you can do batch changes of metadata, including adding tags, descriptions, titles and geotagging your photos right in the app. All you have to do is put in an address or a city and the photo location will upload with the image. It doesn’t get easier than that.