The iPad and iPhone (iOS) markets are interesting. LuckGrib was written specifically for the Mac market, using Apple technologies. A large portion of this effort can be used directly in an iPad/iPhone version. The UI and interaction code would need to be re-thought, re-designed and re-implemented. This isn’t a small amount of work…but it does represent an interesting market.
If LuckGrib is ever to be ported to another platform, that platform would be iOS.
The author isn’t yet committed to doing this work. If you are interested in having LuckGrib be made available on the iPad/iPhone, please let him know.