If you have ever used RunAs utility then SafeLauncher is the best choice for you. It lets you organize your favorite applications and provide a fast and simple way to run them under Windows account you specify. Futhermore it may greatly help you to increase the protection level of your computer. You may run any program (Internet Explorer, ICQ, etc) under the guest account while still working under the account with administrator's privileges.
RunAs Professional is a substitute for Microsoft's command runas. RunAs Professional solves the problem that normal runas does not support the commandline parameter password. RunAs Professional has a lot of more options and features: You culd build crypted files. Only doublecklick on such a file and a choosen application will run with admin-rights.