Fonte: http://phandroid.com/2009/07/07/make-your-icons-display-unread-count/ -  by echid

If the usual banner system used in Android just isn’t doing it for you there is now a different way to make your unread count known to you: the iPhone way. SMS Unread Count is a free widget that allows users to replace the standard icons with those that have message counts.

The widget allows you to change type, counter size and whether you want your icons to show zero count or not. So far only messaging and dialer icons are supported, but developer Kanok Gems has released several updates for the widget already, meaning hopefully support for Gmail, Email, Market and other icons might not be too far off.