Realtime News This is a *nice* social media search engine. It provides you with a whole bunch of stuff. Highlights, News, Twitter tweets, Top Links, Community (broken into influencers, most active and latest) and word clouds.
It's very smooth, clear, has a nice use of columns and is quite like SocialMention, so if you like one, you'll like the other. Give it a try and tell me what you think.