I do agree that a lot of people are using iPads and Macbooks these days. Perhaps in the UK we are a bit behind the times as there are still quite a lot of people that still have Windows laptops - Worship, Inc runs great on even quite low spec laptops.
When the lower cost Windows RT tablets (using the ARM processor) come out later this year that will provide a good platform for the software. One of my complaints with the iPad (being a slightly older worship leader ) is that it's just a bit too small. Apple don't have plans at this stage to do anything bigger that the 9 inch device. There are quite a few 11 and 12 inch devices available for Windows - just a thought...
The iPad version is close now so hopefully we'll have the best of both worlds.
If you want to import the official chord sheets (say from SongSelect) then obviously you would need a SongSelect license and account. We are currently working on including that interface into Worship, Inc
We don't distribute Worship, Inc with any material that requires permission
Hope this helps.