rFlickr
To use this version of rFlickr, first you will need to install the RubyGem you can do by (from a command line):
$ gem sources -a http://gems.github.com (you only have to do this once)
$ sudo gem install digitalpardoe-rflickr
Then you'll need to get a Flickr API key as detailed here:
http://www.flickr.com/services/api/misc.api_keys.html
You'll need to authorize your application's API key from each Flickr user account which wants to use it.
A short guide to get you started can be found here:
http://digitalpardoe.co.uk/blog/show/87
The guide is a little out of date in it's gem installation technique, use the instructions above instead.
This project is still a work in progress, bear with me whilst it is set up.