If you are a Gmail user, and you want to personalize your Gmail according to your Needs, You can do this with a small Plugin for Firefox, You should Download FireFox if you are not using it, it is the most popular browser in the world (see the list of browsers) and has a variety of options to customize it.

Here is What you can do with this Plugin,

Play Sound Whenever new Email arrives in your Inbox.

Shows the Email count in place of the Gmail Favicon.

Show Icons for Attachments so that you can figure out what type of file is attached.

You can Hide Chat boxes, Invite Box, Buzz Count and Spam Counts. You can also hide the ads form the right hand side.

Please note that Customization will effect your Gmail only in Firefox where this Plugin is installed. You Gmail will look the same in other browsers like Google Chrome or Internet Explorer.