Based on the work off some random person off the Internet, a while back I created a simple win32 application to change the timer resolution that Windows uses. This uses the Windows Media function call timeBeginPeriod().
This sort of thing is mostly used by game server administrators to eke out extra performance out of their game servers. This is an alternative to running Windows Media (which does the same thing) or opening IE and running a Flash item (which also does the same thing).
This version allows you to dynamically change the resolution so you can (for example) see what effect different resolutions has on a running Counter-Strike: Source server in terms of server-side frame rate.