In Python 3.3 the os module gained a few new functions and constants:

Python 3.2.2+ (3.2:58a75eeb5c8e, Sep 29 2011, 02:11:05) 
>>> import os; len(dir(os))
232

Python 3.3.0a0 (default:a50f080c22ca+, Oct 25 2011, 09:56:01) 
>>> import os; len(dir(os))
332

http://docs.python.org/dev/py3k/whatsnew/3.3.html#os lists some of these additions, and they are already grouped (e.g. the sched_* functions, the "at" functions, ...).

Before the os API gets even more bloated, maybe we should group some of these functions in new submodules, like os.sched.*.