We've posted a character guide for Chun Li in Street Fighter 3 Third Strike. A gigantic thanks goes out to TJ369 who was a huge help in putting together parts of the guide.Top Chun Li players will 'buffer' her Lightning Legs so they're prepared to throw them out at the drop of a hat. To execute her Lightning Legs, you need to press a Kick button 5 times, fairly quickly. On the 5th press, she'll start hammering away with her leg.
This is good to know because Chun Li can use her Lightning Legs as a counter against people who parry some of her pokes.
The idea here is to have your Lightning Legs ready so that if one of your pokes is parried, it only takes a button press to activate your Legs.