The Saturday evening arrival bank is usually a tight knit affair and as such, you don't want to lose your place in line lest you have to break it off and try the approach again!  One way of dealing with too much speed or getting too tightly spaced by the tower is to perform "S turns" while on final.  Usually a single deviation off the localizer and back will do the trick, but I've seen it done more than once!

Today, I caught this Continental 737 doing one of these approaches to keep it safely separated between the Chautauqua E-145 and the Colgan Dash 8 Q-400 behind.  As usual, the maneuver was performed successfully and no one had to break off their approaches.

Not great shots, but kinda fun to see!