The Smart Invoice iPhone application allows you to remotely use Smart Invoice to:Create new clients, projects, and tasks on the flyTrack time by client, project and taskCreate and categorize expensesCreate invoicesReceive credit card payments for invoices you create on your iPhone (currently works with Authorize.net)this functionality essentially turns your iPhone into a mobile credit card processor.This application requires a Smart Invoice account (you can create one for free at www.SmartInvoice.com), and utilizes the Smart Invoice API to securely transmit data.