Wookiepedia is nice to look things up, so i have it in my favs-list on my desktop and my laptop.
But i do not have internet access everywhere i play. A book is something that i can lug around and all i need is enough light to read it. And if well designed it is especially helpful for those that are not that familiar with the EU. The sheer amount of data available on WP is IMO too much for newcomers, sometimes even for guys like me who read several books.
Not to mention the profiles for the toys ^^