Sounds like the creators of Billable understand this situation. Their new online invoice creator couldn't be any easier to us. Need to invoice someone for arts or freelance work? It's even easier than the pre-baked templates found in Word or Excel. Simply go to the website, fill out the form, and either print or save as a PDF. From their website:
We didn't like invoicing and couldn't find anyone who did. So we created Billable...Billable: Billing Made Simple. Period.Billable is currently in beta and we've got a lot of plans for the future. We're doing this for the creators, for the people who are trying to make something great, but have to pay for noodles in the meantime.