Team Fortress 2 Ingame - Games Convention 2007 - https://www.youtube.com/watch?v=18KpnXQwMz0
Team Fortress 2 Ingame - Games Convention 2007 - Part II - https://www.youtube.com/watch?v=4SWNfy811h0
Team Fortress 2 Ingame - Games Convention 2007 - Part III - https://www.youtube.com/watch?v=7XjRJjfUZ1Q
Team Fortress 2 Ingame - Games Convention 2007 - Well - https://www.youtube.com/watch?v=6HwBZgm82bI
Team Fortress 2 Zelt GC2007 - https://www.youtube.com/watch?v=xq8ndj2f3ds [This one's especially notable, as it is footage inside of the TF2 tent, rather than just a camera filming one of the monitors.]
Vossey.com - Team Fortress 2 @GC 2007 [part one] - https://www.youtube.com/watch?v=ByaYkVKFP00
Vossey.com - Team Fortress 2 @GC 2007 [part two] - https://www.youtube.com/watch?v=nBrORFz7gdM