Useful links:

http://www.origin.com/us/change-id

Unlock the 5 act of valor dog tags
http://actofvalor.com/bf3/

BF3 Config Utility
http://www.techpowerup.com/forums/showthread.php?t=154145

Reflex training for gamers and normal people:
http://www.aim400kg.ru/en/

Weapon Stats:
http://symthic.dy.fi/?s=bf3

Player Stats:
http://bf3stats.com/

Youtubing:
Battlefield Friends http://www.youtube.com/playlist?list=PL5EFADE5F1A6F7492