Here is a collection of Eagle schematic symbols for the most used Arduino chips which has two advantages:
1. The space between the pins is doubled, this allow to create more esthetical circuit diagrams.
2. For easy use, the pin names are according the Arduino pin mappings.
The digital pins are named for instance D0 to D13 instead of PD0 to PB5. The analog pins are named A0, A1 etc.
Also often used functions as PWM and INT0 are added.
You can download the library HERE.
See here an example circuit that shows the advantage of the new Atmega328 library symbol: