This is awesome - I built a site called 22books a couple years ago as a way to learn Ruby... it took me a little longer than 4 weeks but I think I launched with more functionality.
I haven't done much with the site but it actually ended up getting used by teachers and librarians so I would feel bad ever shutting it down.
Hey mate - we spoke on email a few weeks ago! I was gonna drop you a line about the site but things have been a bit manic recently. I think I'm going in a slightly different direction to you so hopefully you don't mind too much that our sites are similar. I'm going to look at exploring the community angle in the coming months so hopefully we won't tread on each others toes too much.
I haven't done much with the site but it actually ended up getting used by teachers and librarians so I would feel bad ever shutting it down.
http://22books.com