Wii Warm Up: Would you like to preorder?

Gamestop is notorious for its preorder policies, but other retailers offer shoppers the opportunity to preorder as well. Do you take part in the practice? If so, do you only preorder big releases (like Wii Fit or Mario Kart) to make sure you get a copy, or do you preorder any game you're looking forward to? If not, have you ever had trouble finding a game on its release day?