There seems to have been a rash of startups based on Twitter in London. Some of the best known are Tweetdeck and Tweetmeme, but others have appeared like Curated.by (which just moved out to the Valley). But one which has been bubbling under and, like curated.by is focused on curated realtime streams, nsyght.com. We covered their relaunch last year when they announced Angel funding from a group of investors which included Shawn Kernes (co-founder of Stubhub). Nsyght's approach is that the product retrieves