I love this idea. With everything on the front page, immediately usable, it would be my first choice for invoicing. If you add required user accounts and a huge

I love this idea. With everything on the front page, immediately usable, it would be my first choice for invoicing. If you add required user accounts and a huge site around it, I've got no reason to switch (optional user accounts obviously wouldn't bother me and I think some people would want them).