Thanks for the responses. I'll need to talk things over with the other person that has become involved in the project, because even though it's more-or-less my

Thanks for the responses. I'll need to talk things over with the other person that has become involved in the project, because even though it's more-or-less my baby, I don't want him to feel that his work is just going to go towards making money for me. I think mechanical_fish may be right, in that I've been thinking of my time as cheap, which is strikingly uncharacteristic for me. It is true that I've put a shocking amount of time into this, when I could have been doing something to earn an income, so perhaps it isn't so unreasonable to try and get a bit of cash out of the process. Thanks! Also, I like the 'semester' and 'lifetime' pricing models. The lifetime subscription model appeals most to me, as most language students seem to fade out after two years. So, if I base my pricing on that assumption, the application should be able to cover its costs, and for those who stick around longer, it'll just be a little reward for their hard work. callosum: An email is on its way. queensnake: Unfortunately, while I could write the application itself in Python, the supporting libraries are not readily portable, and neither are the bits of C glue that I've had to write to link everything together. So, AppEngine is out.