Sometime you might feel very troublesome or inconvenient to log in to your web-based email account every day to check whether there is any new mail in your inbox. It is worse if you have many email accounts. Generally, you can seek help from a notifier program. A notifier program can tell you at a glance if you have got new email by alerting you from your menu bar or taskbar.
There are many forms of Notifiers, from shareware to desktop widgets for Windows and Mac OS X systems. Anyway, if you are using Gmail and Yahoom mail, both have their respective Notifier. Yahoo offers a free Yahoo Mail Checker (Click HERE) while Google has a free Gmail Notifier Program (Click HERE) for their respective users.