Google Docs has been around for a while, but later this year, Apple will give its iWork suite of apps the iCloud treatment, letting you create, access, and edit Pages, Numbers, and Keynote documents from a Web browser on a Mac or Windows PC. Apple calls it iWork for iCloud.
Naturally, Apple would prefer if you used its Safari Web browser to access your cloud-based iWork content, but you'll also be able to use Microsoft's Internet Explorer and Google's Chrome browsers (Apple says iCloud for iWork is optimized for those browsers).
Apple is releasing a developer beta today, and a public beta will become available "later this year."