ShowHN: BillNode - invoicing for developers and designers (billnode.com)

I'm just trying to gage interest from the community at this point. This is something I'd love to build out but would love some feedback and ideas for features to add that would make it interesting enough to sign up. What does the community think?

If DNS doesn't work, try http://billnode.com.s3-website-us-east-1.amazonaws.com