We will shortly be adding the ability for existing authors to comment on articles.  Each comment will contain a backlink to your profile page so its a great way of getting more exposure to your profile.   We are testing at the moment and it should be rolled out in the coming months.

From 1st September 2011:
Article Alley now requires new members to Article Alley to give  original permanent exlusive rights to new articles in order for them to be published on ArticleAlley.com .  Articles from members registered after September 1st, 2011 which are not original and exclusive to ArticleAlley will either be rejected or reposted on one of our other websites which allows non-exclusivity.