Comprehension

Comprehension is a Fallout 2, Fallout Tactics, J.E. Sawyer's Fallout Role-Playing Game, Fallout 3, and Fallout: New Vegas perk.

Fallout 2 and Fallout Tactics
Yes, reading can be fun. You receive twice as many skill points when reading books.

Since you can only get 92% in a skill from books in Fallout 2, this is rather worthless. However, in Fallout Tactics, the number of points you can get is limitless. (Not actually limitless; caps out at around 135% or so.)

Fallout 3
You gain one additional skill point whenever a skill book is read. However, points gained from books before selecting this perk are not doubled.

J.E. Sawyer's Fallout Role-Playing Game
You pay much closer attention to details when you are reading. You gain 50% more skill points when reading skill-increasing books.

Works well if one of your friends has Esteemed Academic, so they can write books for you.

Fallout: New Vegas
You gain an additional skill point for reading a book (For a total of 4 instead of 3), and double the temporary skill points from magazines (For a total of twenty). As in all other instances of the Comprehension perk, it will not affect books and magazines read prior to selecting this perk.