Mint is one of the best web 2.0 apps that I've seen. It's intuitive and simple yet sophisticated and robust (like the iPhone). It automates a ton of financial management processes (i.e. automatic categorization, automatic comparison) that save time. It keeps you informed via emails and alerts based on your preferences (i.e. bank fees, credit card payment due dates). Its comprehensive of your financial picture and flexible to your customization (i.e. custom categories, budgeting thresholds) What else could you ask for in a financial management app? ...especially one that is free!!!

I've personally used smartsheet to manage a group teaching schedule...what I liked about it was that I set it up to automatically email the latest copy of the schedule to attendess of the class. Moreover, I invited instructors to co-edit the spreadsheet. We all had access to one app that kept everyone informed...that was simple! Because Smartsheet is online, you get all of collaboration advantages, but it goes beyond regular online spreadsheets to add in some really smart features that relate to the common use of spreadsheets--like project management features. And it solves some of the key problems--like permissioning sections to separate data input from private analyses. Smartsheet is truly a smart spreadsheet with unlimited use cases.