Vornheim: The Complete City Kit.
Some people swear by it.
Some people hate it.
For the next 48 hours you can make you own opinion about it at little to no cost. In honor of Zak S. being listed as a consultant for D&D Basic, Raggi and the Lamentations of the Flame Princess folks are making Vornheim: The Complete City Kit pay what you want for the next 48 hours.
Check it out.
(BTW, in case you're wondering I LOVE the book and setting).