Evernote - the one-stop-shop app for all business people, entrepreneurs, and folks on the go. It coordinates your calendar, your work files, your notes, your photos, your documents all in one place. One especially nice feature is that it allows you to bookmark online articles to save and read offline at a later time. This app is especially great for anyone who travels for work.
Toggl - to keep you on track. Like a combination of a stopwatch and a time sheet, this is great for entrepreneurs who need to keep track of billable hours for different projects with multiple clients. But it's also helpful for tracking your work on any project- how much time the kids devote to homework, or how long you'll give yourself to read.
PS - Check out Vanessa's segment on CTV Ottawa Morning Live that focuses on apps for organization!