[Plugin: Web Invoice – Invoicing and billing for WordPress] Working Print Option?

I’d love to find a way for the user to print/download the invoice in PDF format.
I’ve tried a couple of the plug ins available but they only seem to pull up the content of the blank invoice page and not the actual invoice details.

I might be pushing the envelope but… it would be even better if the said PDF file was attached to the original email notification so that if the customer was paying by check they wouldn’t have to browse to the site at all 🙂

http://wordpress.org/extend/plugins/web-invoice/