I have a need to develop my own module and have found the module development training which is based on DNN 6.x
I am running DNN 7.x and wanted to know if there is a difference in the module development process from 7.x versus 6.x
If I develop for 6.x, will the module still be functional in 7.x?

Justin,

There is very little different between developing for DNN6 and DNN7. There are some new things in DNN7.

I heartily recommend Chris Hammond's VS templates for DNN modules. You'll find them at codeplex.com.

And, if you develop and compile your module for 6, it will work for 7. There may be one or two esoteric things to watch out for. But, that won't apply to most normal modules.