Research survey from Rubicon Consulting reports that –
Among people who use web apps, the most popular usage is sending and
receiving e-mail through a browser-based client. Games are next, used
by just over 50% of the web app users, followed by music and photo
management and editing.
Web app adoption differs dramatically by application category. Some
of the most discussed web app categories, such as word processing and
spreadsheets, have attracted only a very small percentage of home PC
users to date.
This is in sharp contrast with the lack of web based email add-on applications. Applications which can work with Gmail, Yahoo mail and similar services.