An embedded spreadsheet is a perfect way to display an event calendar, team checklist, or your favorite list of things. To make this easier, Google added five spreadsheet templates to the templates gallery that have been formatted nicely for websites: Embedded Schedule; Embedded Calendar; Reading List; Countdown Timer; Quote of the Day
You can visit above links or go to spreadsheet templates for more information.
In related new, Google currently experimenting some new features in spreadsheets: One of the features lets you record macros for common tasks. Another feature, code-named "Sketchy", allows you to insert different drawings that resembles Microsoft Office's Clip Art. Google Spreadsheets' code also references an option titled "Solver", which could be a tool for solving optimization problems, and an option to protect sheets and cell ranges, reports Google System.