Scripting Google with Google Apps Scripts
Personally, I'm still a bit skeptical. There are certainly some handy features here, but I'm not sure how popular the scripting system will be. The JDBC part is cool, and if you're a premium member you'll be able to build some decent applications on top of the spreadsheet system. But look at it this way: That functionality has existed in Microsoft Excel for many years, but how many people actually build applications in Excel compared to the number of people who simply use Excel for its basic spreadsheet features? Perhaps that will change, and indeed the Google Apps Script system has some nice features, but we'll have to see just how popular it becomes.