tedster - 9:01 pm on Aug 28, 2010 (gmt 0)
I've also seen results from Yahoo Answers and even second-tier sites like ChaCha. Yes, the Twitter stream is strong, especially on the default search, but there is more potential here than that.
There are a number of business offerings these days focused on social media listening. For those services that are exclusively focused on a listening service - meaning it's the entirety of their offering - Google's Realtime Search should be a wake-up call.