Also, avoid the common misconception that FAR/AIM refers to a government publication.

The AIM is a government publication. The government updates it on a schedule with additons by NOTAM. The FAR is simply an shorthand for Title 14 of the Code of Federal Regulations and is "updated" every time a new reg is added or one is changed.

The FAR/AIM or AIM/FAR books are commercial re-publications of those government sources at a specific point in time. And like any republication, it can (and has been) seriously out-of-date by the time you buy one. Most recent example is the 2010 "FAR/AIM" that had Part 61 of the FAR as it existed before October 2009 (a major revision).