Flickr is the best photo sharing website on internet. Flickr Uploadr is the tool to bulk upload images on your flickr account. For Windows there are number of free utility available to download Flickr photo album but this is not the case with Mac OS X.
Here is Photo Grabbr OS X application to download all photo album of your Flickr account. Photo Grabbr is growl support application allows you to search photo of any flickr user with preferred download file size. You can also skip previously download photos.
Photo Grabbr for Mac OS X