You can now view very large amounts of data (like a huge Excel spreadsheet) in the browser with the help of Google Fusion Tables.
You can publish Excel spreadsheet data as PDF that one can download directly from Google servers without having to open the document in Google Docs or another Office application.
Learn how to embed tables and spreadsheet data into live web pages. Your site visitors can interact with the tables and perform function like copy-paste, search, sort, etc.
Blist is a web based tool for creating spreadsheets and databases in a very visual and non-geeky interface. You may either start with a blank canvas or import an existing Excel sheet or use any of the existing lists as a template.
Textris is an online sorting tool that lets you quickly sort and alphabetize a list of records without requiring Excel. You may also use Textris to remove duplicate records from a list.