We were just using Excel but have hired a bookkeeper who will use Quickbooks. I'd love to do it myself but there are only so many hours in a day...plus we've grown quickly and I'm feeling some security in using a professional.
I use Quickbooks for my business and I love it. They offer several versions including a free one <a href="http://quickbooks.intuit.com/product/accounting-software/free-accounting-software.jsp" target="_blank">QuickBooks Simple Start</a> that you can download. The multiple versions make it easy to upgrade... when your business outgrows the current version.