Google has opened up a new sandbox for developers designed to entice them into building richer social networking gadgets for iGoogle. iGoogle is basically a customizable home page for individuals that uses Web-based "gadgets" to deliver content to the page. The new sandbox will let developers continue to build gadgets for individuals too, of course, but the news is that iGoogle's new social features for developers will change iGoogle from a backyard toy to a full-fledged public playground.