I use this app for work and school to keep everything organized. It's great because other users of tungle can check your schedule to see if your busy or not. Great to use for internships, work, school, and social life. If you have a mac you can export your iCal as well
If you have to use more than one password for various online accounts (email, facebook, blogs, etc.) this free download can keep track of all of them. Very easy to use as well