Stuck on blue screen as ran rm* on / folder

I accidently rsn rm* command on / and since then I am unable to see my desktop. All I see blue screen with spinning gear. I want to will I be able to get my desktop settings again without compromising all settings? I am specially concerned with software installed via home brew,Databases etc. is it possible to to restore or xopy deleted files by some kind of repair via Cd?

I am running osx 10.6 snow leopard. Irony is I somehow missed my OS and other CDs too that came with my mac