BTW, you can get to that page by searching for the "launchpad" project on launchpad, clicking on the "Code" tab, and then clicking on the "lp:launchpad" branch.

https://code.edge.launchpad.net/launchpad

There is a link to the source code on this page.

https://code.launchpad.net/~launchpad-pqm/launchpad/db-devel/

I just loved Beyond Numeracy by John Allen Paulos. I found Innumeracy to be a little too slow, but it all depends on where you are in your math studies.

http://www.randomhouse.com/catalog/display.pperl/9780679738077.html