This past weekend Apple launched iWork for iCloud Beta to developers and non-developers alike, who could check out the suite as long as they had a valid Apple ID account set up to use iCloud on iOS devices. The web apps have reportedly garnered lots of interest, so much so that the company on Monday was forced to limit access to iWork for iCloud.
In other words, Apple's online productivity suite has already become too popular, even though it's currently in beta. Attempting to sign up for the service yields an error prompt with the message saying, "We've had an overwhelming response" to iWork for iCloud apps...