One aspect of Catholicism that really appeals to me is the concept of Catholic Social teaching.
Aside from the work of the Church this is perhaps evolved and expressed most eloquently through the works of the Catholic Worker Movement initiated by Dorothy Day and Peter Maurin, although this movement is not an official organ of the church.
Here in the UK we even have our very own Catholic worker Farm! You can read more about the farm at the London Catholic Worker.
All fascinating stuff!