I also have the invoice2go app on my iPhone, I have been using it for almost 2 years now and I can't rate it enough, also gets free regular updates with new software additions. It has around 20 odd templates to use in which you just enter you companies details and you can also upload you own company logo. My customers both domestic and commercial are also very impressed with how efficient the whole program is, once I have completed there work I then sit down with the custy, have a cuppa and type out there invoice and then send it to there email. My bank details and other payment details are also on there you can even set it up for paypal payments which a few of my customers actually prefer. This app also let's you prepare quotes etc, totally invaluable to me, can't praise it enough!
Wayne