Here is an interview with Jeh Daruwala, CEO of Yactraq.com . Their work brings machine learning and natural language processing to the potentially blockbuster world of online videos for targeting of ads based on behaviour. Thus the ads are less spammy, much more relevant, and a win-win for audiences, advertisers and content channels.
There's no doubt that Twitter mashups are very popular. Programmable Web listed 120 in February, 200 in June and 238 Twitter mashups today.