For all Twitter fans, here we have two script that integrates Twitter search results on Google search pages. First is from, Mark Carey that displays the most recent 5 tweets for the query that you are search for, giving both real-time Twitter search results and Google results on the same page. It also adds a link to the Twitter search results in case you want to dig a bit deeper.
Next is from, Franz Enzenhofer, this script adds a simple Twitter link next to Web that displays results with the Twitter user's avatar on their own page. You also need Greasemonkey to let it work.