If you look at the bottom of the Home Page, you'll see a heading All User Defined Sections. There are various topics where threads are grouped by subject, eg Paper Piecing, Mini Quilts and so on. These threads still appear in the main sections of the boards but are grouped here by subject to make a handy reference area for ppl interested in a specific subject. Some of the Virtual Sections can have threads added to them by the author of the thread and others have to be added to by the specified managers. Go have an explore, it's a great resource. :-D
http://www.quiltingboard.com/virtual_section_list.jsp