Does anyone know of a simple invoicing app? I tried Billings and it was a bit of a headache trying to get the thing going, because from what I saw, it relies on your address book to set up clients (which is not what I want to do). I'm looking for an app that allows you to create a profile for a client, add projects to their name, and then maybe export an invoice in to a PDF to send it out when it's time for them to pay. Any suggestions?