I'm also using Quickbooks. It's pretty easy to learn - even if you don't have an accounting background. When I got started I had my tax CPA look over my books

I'm also using Quickbooks. It's pretty easy to learn - even if you don't have an accounting background. When I got started I had my tax CPA look over my books to make sure I was doing things right. Also, you should check out http://oe.quickbooks.com/ http://oe.quickbooks.com/ - it's an online version of the software, which I've been pretty happy with. Subscription is $20 a month (vs. $150-$400 for the install). It's great for startups that aren't sure how long they're going to be around...