Smart cache-busting for your WordPress stylesheet.: If you frequently change your WordPress stylesheet or are working on it and would like your readers to pull the new stylesheet every time instead of using a cached version (which might display a borked page), this tutorial and the subsequent plugin might be for you. Alister explains the issue in detail, provides a tutorial on how to acheive the results and then with some prodding from Matt, comes up with a plugin the get the same result which does not require any modification of code.