I love how you've taken the friction out of the signup process and the preview is great. However I can't use it as because I have the following text on my invoices:

1) In Canada you must include your GST# (looks like "55555 5555 RT001")

2) My business address, consultant contact name/email

3) Payment instructions (doesn't quite fit under terms, i.e. Checks payable to, or Wire Transfer / SWIFT code)

4) Ability to add additional billing information (i.e. one of the big companies requires department, a service agreement # and company contact under the "Bill To:")

5) Canadian dollar currency :)