The 'Table converter' plugin uses Mr. Data Converter to parse spreadsheet CSV data and convert it to HTML code.
The resulted HTML code can be embedded in any Web page for a nice rendering of the spreadsheet data.
The outputted tables, if desired to, can support column-based data sorting.
A demo is included with the download package.
Works with direct copy&pasted data from Google Docs. For Excel or OpenOffice Calc files, the files have to either be uploaded to Google Docs first, or their data needs to be exported to a CSV file.