Recent rule changes in both mountain bike and cyclocross racing have increased the prevalence of spare wheels in the pit area equipped with disc brakes. Many of those racers have also realised that, in spite of so-called 'standards', the disc rotor spacing on their panoply of spare wheels can vary a bit. Given the tight clearances on most typical disc brake calipers, it doesn't take much of a shift to create some substantial disc pad rubbing. 
Rather than iteratively readjust or re-shim their brake calipers with each wheel swap (which, obviously, isn't practical during an event), the more astute riders have rather shimmed their disc rotors so that they all match up, enabling quick and easy wheel swaps with consistent braking performance.
Still, fiddling with tiny shims in multiples of six can be headache inducing, and slight variances in the shims themselves can result in a slightly warped rotor - thus repeating the same problem you were hoping to solve. Instead, the clever Germans at Syntace offer a one-piece rotor shim that is designed to serve the same function as the individual ones. Not only are these much more convenient to handle but they are also properly sized for the M5 bolts commonly used to secure the rotors instead of the larger M6 bolts used for brake calipers.
Syntace's 0.2mm-thick disc rotor shims are offered in packages of eight.
They are available now through QBP, part number BR5015. You may not need them for Hayes or Avid brake set-ups if you're only using one set of wheels, but they are a very simple thing for setting up Disc Brakes properly for any bike. A package should retail for about $10.99.
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