It may not be just *your* interest, The39thStep, but you are the person that is specifically raising it (again).
Afed and Solfed are two different anarchist organisations, and operate separately with different constitutions and aims/objectives which are set out on their respective websites.I'm not a member of either and never have have been, so I can only describe what I perceive to be the differences and someone more knowledgeable than me can put me right if necessary.
Afed - Anarcho-communist, a class struggle organisation which aims to abolish capitalism. Some of its members meet and organise, but it's possible to be a member without becoming involved in direct action.
Solfed - Anarcho- syndicalist, which is anarchism applied to the workers' movement. A revolutionary union based on direct action and direct democracy. Its members meet and organise.