Wow, you can learn a lot by casually reading your friend’s tweets. Today I heard about Harvest, an online time tracking and invoicing application. Many self-employed/freelancers are looking for a simple solution to do invoicing and keep up with their accounts receivable. Harvest has some cool bells and whistles like recurring invoices, expense tracking and can export time sheet data into Quickbooks. The individual pricing for Harvest at $12 is comparable to Blinksale which is what I use, but there’s a limit of only 30 active clients and 20 active projects. If you have lots of small jobs/clients, then you may have move up to the next level which is $40/month. For Blinksale, there is unlimited clients and you can have payment linked to your PayPal account. There’s another simple invoicing web application Curdbee which is absolutely free. Curdbee allows you to accept payments via Paypal and Google Checkout. Plus it also accepts other currencies. I suggest you do a little research and select the best one for your invoicing needs. Any of these is better than a word document since the faster you invoice, means the faster you will get paid.