Nah, just different domains that's all.

I work for a company where our "suite" consists of 3 large components: a back-end system, a web-app, and software installed to the devices.

The back-end systems guy read mostly Java, JavaEE, EJB3.x (the better one of course), JMX, PostgreSQL (admin, performance, the usual drill) and everything that DHH mentioned.

The web-app guys read mostly front-end stuff (JS, Backbone, Underscore, MVVM/MVC/MVP technique, CSS spriting, YUI compressors).

The software/firmware/hardware guys are reading what you listed above (including Advanced Programming in the UNIX Environments, UNIX Network Programming vol 1-2, Windows Internals, etc).

Still relevant :)