The Invoice Machine has the kind of interface that will appeal to style-conscious Mac Users, but the product is aimed at freelancers everywhere. Sign in to the service, and users can generate slick looking emailable invoices straight into client inboxes. As per usual with the new breed of Internet based services, the site offers a free version (3 invoices per month) and the paid options kick in after that, to a current maximum of $48 per month for 3000 invoices. Needless to say, if one uses an accounting package, the invoice totals will need to be double-entered there as well.