Another nice extension for Google Chrome users, the Chrome Clock extension displays a clock with the current time in the extension bar and also allows users to set a alarm.
The clock will start blinking when you have at the time you set the alarm, however there is no support for sound yet.
To setup a alarm, click on the clock and enter the hour and minute when you want the alarm to go off, hit enter when your done. To disable the alarm just click on the ! sign on the clock.
There are several more extensions available for Google Chrome, take a look at the Google Chrome Extensions list to find more useful and handy extensions.