I received these dice in the mail from Inkwell Ideas (http://inkwellideas.com) yesterday. They look like they will be a nice way to generate one-off adventures off the cuff for fantasy role playing games. I can even imagine using them for historical adventures or pulp games.
There are three sets of five dice — or 15 dice. That makes 6^15 combinations or 470,184,984,576 if you use all 15 at the same time. All of the sides are geomorphic, which means no matter what you roll they will fit together.
This company has some other interesting products. It is worth a look at their Web page. I will likely order a few more things from their site.