If you just want to remove their image from one view or page, and not every list in a web application, then you can use the favorite tool S harePoint UI hackers around the world - the web part of the content editor (CEWP) along with javascript / jquery / css.
In this case, simple, CSS only is required.
For SharePoint 2010
The new image is displayed like this
<IMG class="ms-newgif" title="New" alt="New" src="/_layouts/1033/images/new.gif">
So, if you add the following style to CEWP (you need to use HTML Source View, not Rich Text Editor).
<style> IMG.ms-newgif {display:none;} </style>
The new image will be hidden.
WSS3 and SharePoint 2007
CSS is a bit trickier
<style> TABLE.ms-unselectedtitle TD.ms-vb IMG {display:none;} TABLE.ms-selectedtitle TD.ms-vb IMG {display:none;} </style>
Ryan
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