Freecell Tricks

Instant Victory
At any time during the game enter the following code....
Ctrl + Shift + F10
A screen with three options will appear, choose Abort then make a play and you should win the game.

Easter Eggs
Hidden games
From the game menu, choose 'Select game'. Enter -1 or -2 when the game asks you to enter a number.

Solitaire Trick (Quick Win)

While playing a solitaire press alt+shift+2. Then you'll have a quick win