Two days back Google released a sneak peek preview of Google Spreadsheet. Google hasn’t opened up the “Ajax spreadsheet” to the general public yet. In order to try, you need to request an invitation.
As of now there have been 4 products released in Google’s Online Office Suite
However the Google spreadsheet is far away compared to Excel in terms of features. The unique feature of GS is supposed to be the ability to collaboratively edit a spreadsheet online. Here are few snapshots
(I opened a xls file from my computer and GS loaded it pretty fast.)
(I haven’t been able to see how exactly this works)
Options (Available as of now)
Tour of GS