You guys seem to be my de facto sounding board...
I am nearing completion of the first version of the FreqFinder app for iPhone and Android. It keeps track of all of your transmitter channels in use and then calculates the intermodulation products between them and tells you if any channels are being affected by intermodulation products. It is meant to be a replacement for the Lectrosonics intermod chart. It will also test all of a transmitter's options against the channels in use and provide a list of usable channels for when the need arrises to change frequencies.
An add-on will provide a comparison against the fcc tv station database for users located in the US.
First supported transmitters will be Lectrosonics and Comtek, but more will be added over time.
The price will be $30 for the base app and $15 for the US TV add-on.
Also, current front runner for the name is FreqFinder, but TXCentral is also an option.