U. Ustream
Recently profiled in GQ Magazine for its popularity amongst the Occupy movement, Ustream allows its users to engage in the practice of lifecasting, broadcasting events in real time to viewers, with programming including the likes of political debates and the Arena Football League.
V. Viagogo

An online exchange that allows its users to buy and sell tickets for an assortment of different events around the world, ranging from concerts to sports matches. Functioning in effect as a specialised version of eBay, the site provides an honest alternative to scalpers, allowing venues to fill as many seats as possible whilst individuals can rid themselves of tickets that they do not need.