I've seen Microsoft Kumo & Bing's photos around the web and blogged Kumo once but I saw Bing was one of the trending topics in Twitter and felt the demand on a new search engine. (You know, the old one is Google.) Web users look forward to a search engine which has much more related searches, more web 2.0 capabilities(I mean AJAX).
Even the co-founder of Apple Inc. Steve Wozniak said: "I thought it was one of the most astounding software demos I've ever seen." after Bing's presentation.