Well, it looks like I was a little off. Last month I suggested that maybe Google would purchase JotSpot because I was impressed with their Tracker online spreadsheet. Turns out that Salesforce.com partnered with them in some way. Not sure what the partnership is because I don't use Salesforce.com.
But, Google has apparently been already building their own spreadsheet application, set to go live today. Link above to sign-up to get into the test.
One of the cool features is it looks like they've integrated their chat into it, just like in GMail. I assume that's one of the things holding up their announcement of their word processing program, that they're working to integrate chat into their recent purchase of Writely.