All of the details are posted for the 18th Annual Conference for Software User Assistance.

The event takes place March 21-24 in Seattle. Registration is open and early discounts are in effect. The conference features cutting-edge topics from great speakers along with networking, an exhibition, project showcase, and certificate programs.

DITA is an important interest area and many topics are devoted to this area:

http://www.writersua.com/ohc/focus.htm#structure