There is a lot of good configuration examples all different from one another depending on what you want to achieve.
There's a good link to start:
http://www.cisco.com/en/US/tech/tk801/tk379/tech_configuration_examples_list.html
Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México