agentzh's Nginx Tutorials
There's two of us at 37signals building projects on top of the HttpLua / ngx_lua module. The OpenResty (http://www.openresty.org) project is absolutely worth a look if you are willing to live on the edge and you wan't incredibly fast performance. I can't say enough good things about the work agentzh and chaoslawful have been up to lately -- just check out their Github profiles.