The blog has a limited number of direct contributors and itself syndicates a few other "agile process", XP, and testing related feeds.
Description from the website:
This site has been created by staff members of Agitar Software. We love, live and breathe software quality. Here we have a place to post stories that reflect our personal interests. We will also look to invite contributions by others in the industry. Every reader is welcome to contribute to the forum (although it is monitored), if you have articles to contribute, please contact Mark de Visser at email@example.com.