Just reading this 
blog post by the soldier from 
Team Fortess 2, I can hear his voice in my head really clearly and it's done really well. The blog announces some avatars that you can use with your Steam account but then it goes into four things one should always do:
1. Getting a haircut
2. Yelling
3. Digesting ribs
4. Hill defense
Hmm, should that fourth one be something that's coming to the game in the next update?