Google realtime allows you to search on realtime results, or as close as realtime as Google can get. Which means that things like Twitter tweats will be searchable and viewable as they are placed. The search screen at the top will update automatically as new items are posted.
To get the instant results, click on the "Show Options" below the search URL field box, and then select "Latest" from the time and date ranges. As new results come in they will be posted to the search results view, right at the top of all the results.
Welcome to the real time search world!