How do I change my Field of View?
According to a question on the now defunct teamfortress2fort.com
It's in the Multiplayer tab of the options window
Yes you can! in console
fov 90
(~ = console that you need to enable in multiplayer options)
at least this worked for me :)
It now appears to be limited to 70 degrees for TF2, much to my annoyance (I play on a triple monitor setup with 15:4 aspect ratio, and everything is severely distorted at the edges of the screen).