Here are five reasons that you should download the beta :
1.Ribbons. OK. I admit that the ribbon interface takes some getting used to. If you are still using Office 2003 and you are used to the standard menu options across the top of your Office application screens, prepare yourself for a little learning curve when you start using Office 2010.
2. Backstage View. This feature is more relevant for users of Office 2007. In Office 2007 a round Office button replaced many of the functions commonly accessed from the menu bar such as saving and printing. That button never really seemed to catch on.
3. Paste Preview. Microsoft collected user feedback and found that very frequently users end up undoing a paste action once it is completed. Basically, the text or image pasted ends up not looking the way the user intended so they remove it and start over.
Paste Preview allows you to see what the paste will look like if you complete the action, enabling you to save some time and energy and get it right the first time. It also gives you the choice of maintaining the formatting from the source, merging the formatting, or pasting just the text with no formatting.
4.Excel Sparklines. Excel has always had a variety of charts and graphs available to visually depict data and trends. With Excel 2010, though, Microsoft has added a new feature called Sparklines, which allows you to place a mini-graph or trend line in a single cell.
The Sparklines are a cool way to quickly and simply add a visual element without having to go through the effort of inserting a graph or chart that overwhelms the worksheet.
5. Social Networking Integration. Microsoft recognizes the social networking trend by adding Outlook Social Connector to the Outlook 2010 application. Outlook Social Connector will let you see emails, status updates, shared files and photos, and more all in a single view. You will also be able to see who your mutual friends are and other information to help you maintain and extend your social network