Derek,
I have Textnow setup on my iphone4. And I followed your instructions for setting up google voice and text.
Everything works fine when I initate a text to my friends and they respond back. It also works when my friend text me at my @textnow.me address
My question, can my friend text me using my google voice phone number and it will forward to my textnow app on my iphone?
Of course, you have to go into the settings for google voice and forward your texts to the textnow.me address. Once you initiate that first text with GV, all your texts to and from that person will use your google voice number. They can text you anytime from that number too.