Upflickr v0.1.6 was released this past weekend.

Upflickr is a ruby gem that provides a wrapper for the Flickr API, making it easy to upload and organize images on Flickr using ruby code.

Current functions include: upload image, delete image, set image license, create photoset, delete photoset, add image to photoset, remove image from photoset, list images, list photosets, authenticate, check authentication.

Learn more on the official documentation page:
http://bitsynthesis.com/upflickr/