You should guys should talk to the guys at Steve Jackson Games and see if you could negotiate the creation of a Dungeond of Dredmor themed expansion deck for their popular fantasy RPG themed card game Munchkin. Munchkin is a very popular game and if you could get them to do a Dredmor themed expansion pack it could really raise awareness of your product.
Disclaimer: This post is not a statement on Gaslamp Games' part. I am not involved in the business aspect of the company whatsoever and this is only my personal feelings. I find the idea incredibly hilarious, and as a Munchkin fan would love to see a Dredmor munchkin set. (The art would be so perfect!) That said, I sincerely doubt that they would care, as Dredmor is hardly what I would describe as a popular licensed property. I have a feeling such a thing would be a novelty for hardcore fans, at best.
Considering that the whole game is pretty much pun-based, for as long as they were able to get some hilarity from DoD onto the cards, and they would be able to, I think it's possible for them to agree with them. Oh boy, I would so love to be able to sic Brax on my friends (backstabbing targets, I mean) when playing Munchkin.