This Google Maps mashup holds a lot of information about almost everywhere in the world. The site aggregates information from a number of sources to give you the background on local places, upcoming events and travel guides for any location in the world.
Using the map it is possible to find out about the local night-life and entertainment venues of a location. These points of interest are listed under 'Places' in the bottom menu. 'Places' are categorised into bars, clubs, restaurants, shopping and movies (powered by Trusted Places). Upcoming events are categorised into arts, concerts, culture, festivals, night-life and sports (from Eventful, Lastfm).
Using the travel section it is possible to book flights, hotels, hostels and get travel guides (from WikiTravel). And, if all that wasn't enough, the map also displays the local weather.