It's not the most accepted Google service, but Google Real time is useful as an alternative to Twitter's search engine. The service is no longer obtainable at the moment, the "Real time" option disappeared from Google's sidebar and google.com/real time returns a 404 error. Google says that this is just temporary. "We've temporarily disabled google.com/real time. We're exploring how to slot in our lately launched Google+ project into this functionality going forward, so stay tuned."
Google+ doesn't offer a search feature for messages yet, but it should be obtainable soon. It's strange to see that Google had to stop a service to add support for a new site.
Search Engine Land also reports that Google's Wonder Wheel feature is no longer obtainable. "[Google's] spokesperson said that the search tool was removed due to the 'initial stage' of the Google site redesign announced [last] week."
It's probable that both Google Real time and Wonder Wheel had to be redesigned, but Google didn't want to delay the launch of the new border until they're ready. When Google Instant was launched, many of the higher features were not obtainable, but some of them were extra after a few weeks.