Since its inception, SIGDAT's primary mission has been to organize a series of conferences and workshops, inluding EMNLP (the Conference on Empirical Methods in Natural Language Processing) and WVLC (The Workshop on Very Large Corpora). These meetings have become quite popular, and and EMNLP is now typically a 3-day conference with 250-500 attendees and 800-1200 page proceedings.
SIGDAT is generally focused on corpus-based and statistical methods in Natural Language Processing, and encourages initiatives in support of this broader mission from its members.
SIGDAT is currently in the process of completing is consitution drafting and approval process and will be holding elections for officers shortly thereafter.