IMDb is the world’s most popular and authoritative source for movie, TV and celebrity content. The IMDb consumer site (www.imdb.com) is the #1 movie website in the world with a combined web and mobile audience of more than 160 million unique monthly visitors. IMDb offers a searchable database of more than 100 million data items including more than 2 million movies, TV and entertainment programs and more than 4 million cast and crew members.
Finding links between two actors
There used to be a search box at the end of any actor's page where you could type the name of a different actor and find out all the movies they worke
IMDb announcement: Top 250 Contributors for 2012
This is in reference to Col Needham's thread IMDb announcement: Top 250 Contributors for 2012 This plot shows the rank versus number of contribution