The Office tips contest has ended. But you'll find all the past winners here, categorized by Office program. Use these tips, and watch your productivity soar.
Microsoft Office Tips :
hxxp://www.microsoft.com/office/using/tips/archives/officetips.asp

Microsoft Word Tips :
hxxp://www.microsoft.com/office/using/tips/archives/wordtips.asp

Microsoft Excel Tips :
hxxp://www.microsoft.com/office/using/tips/archives/exceltips.asp

Microsoft Outlook® Tips :
hxxp://www.microsoft.com/office/using/tips/archives/outlooktips.asp

Microsoft PowerPoint® Tips :
hxxp://www.microsoft.com/office/using/tips/archives/ppttips.asp

Microsoft Access Tips :
hxxp://www.microsoft.com/office/using/tips/archives/accesstips.asp

Microsoft FrontPage® Tips :
hxxp://www.microsoft.com/frontpage/using/fptips.htm

Microsoft MapPoint® Tips :
hxxp://www.microsoft.com/office/using/tips/archives/MapPointTips.asp

Microsoft Visio® Tips :
hxxp://www.microsoft.com/office/using/tips/archives/visiotips.asp

didn't know that M$ this kind of TIPs competition...
looks fun...