The author of Ren’Py (the best visual novel engine and the tool I recommend most enthusiastically for this weekend’s miniLD #27) has expressed support for Ludum Dare! He is frantically working on bugfixes for a fresh new version of Ren’Py for you all to enjoy this weekend.
Be sure to check it out: this is a master work and a labour of love that has been constantly updated for over two years. http://www.renpy.org/why.html
I warmly encourage everyone to follow him on twitter: http://twitter.com/#!/renpytom