Hi Robbie,
No, there will only be a version that runs on iOS. It would take far too much time to write a Mac and PC version of this program and maintain it. Since the iOS has been getting more powerful with every major release, and with iOS 4 we can now do just about everything we wanted to do with Time Master directly on the device.
If you have huge lists of data that you need to import from you computer, download our import templates, fill in the data, email them to your device and import them.
We hope to be able to create some sort of alternate invoice templates at some point, but have a long list of features that we are going to be adding to Time Master before that, so we do not have any clue as to when that may happen.
Thanks for writing, we appreciate the feedback!