For those of you who like to customize windows, I'm creating a little app that will clear your icon cache (7 and Vista only). This also works if your icons get messed up. I needed something like this, had to do it manually, so I'm building it, it might be out today even.
Get Opera, a free Web Browser, it's the fastest in the world and is fully customizable, it is also cross platform (Works on Linux, Mac OS, and Windows). It is also available for many phones and devices, such as the Wii, and applicable TVs.