The Slide Library is not a default list and you will need to find the feature that contains the library.
I copied the feature guid and type from the SlideLibrary feature located at C:\Program Files\Common Files\microsoft shared\Web Server Extensions\12\TEMPLATE\FEATURES\SlideLibrary\
Using the guid and type you can add the library by the following overload.
web.Lists.Add("name-of-the-slide-library", "description-field-you-can-use", "name-of-the-slide-library", "0be49fe9-9bc9-409d-abf9-702753bd878d", 2100, "101");