That's a very interesting project.

I've been working on another tool, http://crossclj.info focused on cross-referencing a large parte of the open-source ecosystem for Clojure and ClojureScript (some 3600+ projects).

You can browse both the source code (jumping to definitions across projects) and the auto-generated docs of the whole codebase.

Very Neat! Fast search of src code is also a personal itch of mine - I also work on site/webapp at let you search source code with mouse click.

http://www.srcmap.org/s/sl.htm/p=about#c=ABOUT

It cross reference of any strings in any text files inside a project.

I indexed the linux, bsd kernel, android AOSP (JB), openstack, golang, raspberrypi_userland, elasticsearch, nodejs and few other projects with it on that site.

I would suggest "Computational Complexity" by C.H. Papadimitriou

Great material, great exercises, very good bibliography

For statistics, maybe you can start from:

http://www.statsoft.com/textbook/stathome.html