Hi,
We have all talked about some of the new features in the Excel 2007. But there is one feature that has been missed in the heap of all the new big features. The features on the extensibility.
Excel 2003 had some restriction on the size of data it can work with (Believe me I have faced it when need to present reports with huge amount of data.). The amount of data that excel 2007 can take is much more than excel 2003. Here is a small comparison between the 2.