Sparklines in Excel 2010 let you show a chart in a single cell, to visualise data
Excel now supports simultaneous co-authoring, though unlike Word this works in Web Excel as well as in the desktop application. It also requires Sharepoint 2010. After that, the best new feature is Sparklines – small charts which live in a single cell. Using Sparklines, you can show trends visually either alongside or behind your data. There are also improvements to pivot tables and pivot charts, making it easier to visualise multi-dimensional data. 64-bit Excel enables editing of spreadsheets larger than 2Gbytes.