Mac App Store, search for SwitchList, and have your own copy of SwitchList put safely on your Mac with none of that downloading and installing. The App Store version of SwitchList is the same as the version you'd download from the SwitchList homepage, and it's the same free price. You'll also be able to update SwitchList easily when new versions come out.
I'll continue to have copies of SwitchList to download at the SwitchList home page. Downloaded versions will usually have features and bug fixes a bit sooner than the App Store, so if you want to try out new versions before anyone else, watch the SwitchList mailing list and download new versions as they appear. The source code to SwitchList will continue to be available at code.google.com if you're interested in making your own tweaks to the program, or want to help make SwitchList even more useful.