"Note: This version (1.1) is free but we will, at some point, have to start charging. We haven't nailed down exactly when that will be though." - Developer's Web Site

I haven't tried it yet, but it seems like a very useful app, at least for my arsenal. With that said, and considering your comment above, make it Shareware with a free 30-day trial.

Suggestion: offer it for $10 USD ... the lower the price, the more people will be willing to pay for it.

Consumers who find it useful will pay a reasonable fee. Personnally I, as a consumer, want you to be motivated to continue development ... good development takes time, and we all need to eat.

Free software is always nice, but not at the expense of the developer losing interest, or waiting too long and charging too much. IMHO ; )