compsci

The ACM is the largest association of computing professionals in the country.  They have a number of interest groups, including a special interest group for computer science educators, or SIGCSE.  The SIGCSE holds two annual conferences.  The one in the United States is an extremely good resource.  You can come back with more books and materials than you can carry, and attend workshops and classes throughout the entire day and late into the night.

The workshop fees are nominal, so you can go for cheap and they will provide you with a couple of meals.  Highly recommended!