This looks like a cool idea.

Demo Link You should put a sample Project Plan XML with some demo data alongwith a demo link. This way, someone with MS Project can download the XML and see how it "feels" in MPP and compare it with the online version.

Copyediting > PMOcean can remove one FTE analyst role from your staffing plan on larger projects. Please don't scare your potential users, :) Every product has a positive impact, while creating an adverse situation for someone. E.g. how E-mail impacted the postal departments.The offering should be put in a positive context.

Viral Why not offer a Sign up with LinkedIn account?

Disclaimer: I'm probably not your customer, but will be happy to see this idea take off.