Google is supposed to launch an online spreadsheet today to a limited number of users.

According to a story on the WSJ, the first version of the spreadsheet will be very simple in terms of features. The Google spreadsheets are stored online. Data import is available.

Google bought in March a company called Writely (site) that offers online document editing and shared collaboration (screen-shot below). Now they just need a Powerpoint online clone and Google is all set for an online Google Office. Online spreadsheets or online document editing is nothing new. But if Google is offering it for free it becomes interesting and a threat to Microsoft.
A Google Spreadsheets tour and sign-up are available on the Google site.