I'm thinking about starting a series. Luke Muelhauser over at Common Sense Atheism has been running a series called "Mapping the Kalam". I'm thinking about doing a similar series: "Mapping the Fine-Tuning Argument".
The idea would be to start out with purely logical/philosophical objections to the argument and then work our way into objections that have more to do with physics.
I'm aware of the multiverse objections (including Lee Smolin's cosmological natural selection hypothesis). I've also made a short laundry list of various other objections I know about it. But until I get the series up and running, I'd like my readers to post (in the comments) all the objections you know of, and preferably include a source for who argued the claim (a philosophical paper, book, etc.).