See Programmer's Baseball Cards

Press S to make the batter spit and keep pressing till the cards appear

Extra Teams (Microsoft, Robots & Wizbang)

First click the "Help" option then "About". Now right click twice when Wizbang appears on the first line of the copyright statement

Unlimited Strikeouts

When you are up to bat hold CTRL+R and you will hear a gunshot sound, that means you have unlimited strikeouts, but if your player pops a fly groundout etc., you will lose the person you were batting with, just without a out. If you don't want it anymore, hold CTRL+R and you should hear a wipe away sound

Go to Training

Press CTRL + T