Addictomatic: Search for any key word and create a custom page that pulls together data about that keyword available from a wide variety of websites.
Bloglines: Bloglines makes is easy to find and track your favorite websites and blogs in real-time. You can customize your dashboard with multiple view options, drag and drop organization, and exclusive widgets.
Social Mention: Search for any keyword and get the latest updates in real time. It also measures the passion, sentiment, reach, top users, strength and top keywords of whatever your search quest is.
Technocrati: High quality search site for sifting through blogs. Is not up to date, but the quality of the results is generally very high.
Hootsuite: A social media management dashboard. Allows you to monitor and manage all your social media platforms in one interface. There is also an option to " go pro" in which you can get reports and summaries of your social networking efforts. Perfect for marketers.
Trackur.com: Social media monitoring. Easy interface, simple navigation and fast response.
Here is a list of other social media monitoring tools.