Buy a year of Flickr Pro, get 3 months free!
Compared to free Flickr account, the Pro accounts give you unlimited uploads, collections, sets, the ability to retrieve previously-uploaded full-resolution images and no ads on the site.
A lot of you probably use Flickr already, so if you have been thinking of upgrading to Pro, now's the time to do it! :)
One year's Flickr Pro costs USD $24.95.