Ask HN: Please review my project: HTML to PDF online API

Dear HNers,

This March I launched my new project. It is an online service providing HTML to PDF API. It can convert either URLs or uploaded HTML files. For convenience, API bindings for Python, Ruby, and CSharp are provided.

The service is in a fully functional free beta. I would appreciate any feedback people might have.

Thanks.

link: http://pdfcrowd.com (invitation code: hackernews)