Thursday Tip: Envelope Modifier Keys
Enveloping allows you to create some really cool effects. Most users limit themselves to using it on text, but keep in mind that it also works on vector graphics. One of my favorites tricks is to use the Ctrl and Shift keys to modify the function of enveloping. If you hold the Ctrl key while moving one of the envelope's nodes, the opposite node will move the same direction and same distance. Using the Shift key will move the opposite node the same amount in the opposite direction. This can often give you just the effect you want and is much easier than trying to move both nodes the same amount manually.