This will be a huge post where I'll include stuff from my previous. So,

Game sites

http://www.kongregate.com/
http://www.armorgames.com/
http://diseasedproductions.com/

Some tutorials.

http://www.kongregate.com/games/Kongre gate/shootorial-0
http://www.kongregate.com/games/Kongre gate/shootorial-1
http://www.kongregate.com/games/Kongre gate/shootorial-2
http://www.kongregate.com/games/Kongre gate/shootorial-3
http://www.kongregate.com/games/Kongre gate/shootorial-4
http://www.kongregate.com/games/Kongre gate/shootorial-5
http://www.kongregate.com/games/Kongre gate/shootorial-6
http://www.kongregate.com/games/Kongre gate/shootorial-7
http://www.kongregate.com/games/Kongre gate/shootorial-8

Current Work.

I'm currently trying to achieve all the Thing Thing Arena 3 medals. My favourites are:

Collateral Damage
LAZOR OVURLOAD
Corrosive Personality
Shove It Up Their Nose And Pull The Trigger
Piercing Glare
Shotgun Sniper
Never Bring A Pistol To A Rifle Fight
TAG! YOU'RE DEAD!

I've achieved all of them exept Corrosive Personality. I'll achieve that soon. ;)