Let me just point out that this is also a free site, built with the idea of creating and indexing as many interesting resources for the pianist as possible, and displaying sheet music in a comfortable way (I think it is convenient to be able to quickly look at scores without the need of downloading them), ideally getting to be an interesting and collaborative wiki-site.

Donations would be used to cover expenses coming from legal problems on copyright if they arose, as I have seen similar sites having to pay expensive fines and I am not a lawyer myself. I also had the idea of buying the right to display non-free sheet music if this site got enough donations (no donations received up to now by the way), as the site Musopen is doing with performances of public domain music; I think this would be an interesting resource particularly for students.

~Androide23