Lucasfilm is the company that owns the rights to many of the most popular movies of all time, which makes it a home video-oriented company right now; they are currently prepping what will surely be the biggest-selling Blu Ray set in history, in which the copyrights are owned by them exclusively. However, they also produce a very successful and award-winning cartoon series, which they fund and make independently, and are developing another live-action series, as well as having just produced a feature film called Red Tails that will soon be released. They also are producing 3D conversions for some of their past releases (the 6 Star Wars films). There are probably a lot of other day-to-day activities we aren't aware of, and other projects in the pipeline that aren't public knowledge.

So yes, there are many points to their existance, so this seems like a silly question. Also, I believe companies like Lucasbooks and Lucasarts are divisions of Lucasfilm, so there is a lot of managing the dozens of other printed and electronic products they make, plus of course the toys. Lucasfilm is a vast, multi-media entertainment company, and the actual film/television production part of it is as busy as it ever is.