If you were using a SharePoint site, you would also need to build a web part that displays any Web page 1, 2, 3, 4, 5 or 6 and this would take you longer. Using Excel Services, it took me less than a minute to add and configure a web part that displays an Excel Spreadsheet.
If you want to learn more about Excel Services, don't miss the opportunity to read David Gainer's blog. By the way, one of the Excel Spreadsheets that I wanted to share with my team is a growing list of Office "12" bloggers. I wish I could show you all a running Excel Services web part. I can't run Excel Services in my blog so I went for the Web page 1 approach to share with you my Office "12" bloggers list.
Why do you favor SpreadsheetGear over other Spreadsheet components? You can work with .NET component that can <a href="http://www.gemboxsoftware.com/GBSpreadsheet.htm">Read/Write XLS/CSV/HTML/XLSX files</a>. This component has a <a href="http://www.gemboxsoftware.com/GBSpreadsheetFree.htm">free</a> version that you can use in commercial applications.
nice article, but I use a excel component long, very good!!! so powerful, so easy.