A good friend of mine named Kaibz put together this short video of teamwork on a public community server in Team Fortress 2. I'd imagine a lot of you have played TF2 at some time or another, so might appreciate the video.
To me it epitomises how fantastic the game can be when you have a team working together and communicating effectively. He's done a great job with the edit. Enjoy!
For those that are interested, the server the gameplay comes from is Triggerhappygamers.com (EU Community) #1 Fun Server (IP: 188.8.131.52:27015).
It is located in the UK, so the latency may be prohibitively high for those outside Europe, but most evenings you can find games with a lot of teamwork and good microphone communication here.
[i hope this is an appropriate place to post this, just let me know if not and I'll remove it].
Edit: I can't for the life of me work out how to embed the youtube video, sorry!