So you want to be an LPFM station operator?
Michi Eyre at REC Networks has a few (free) tools that could be of big help.
In the wake of recent FCC decisions, REC has been updating and upgrading its radio broadcast facility information tools.
Most important, perhaps, is the LPFM Channel/Point Viewer. It makes quick work of pinpointing what frequencies may be available and where they are available, sans interference considerations, in a particular market. The Google maps integration makes it fun to simply “look around.” It carries info on the top 150 markets.