A new pixel adoption site I came across recently is Dragonadopters, and its proving rather fun. This is my little guy, Mericio the furdragon:
While clicks and visits are encouraged, they are not the only thing controlling your dragon's progress. Happiness and a full tummy also help. There is also an option to create items for your dragon to wear. Most give a bonus to resource production (for mine its dragon fur and blue aura) but special items can increase happiness, reduce their hunger, or increase growth rate, among other things.
If you like the sound of that, you can register by clicking their banner below. If you do get an egg, or have a dragon already, post its code as a reply (html for LJ) and I'll add it to my daily clicking list :)