Imdb.com

Advantages: thorough and has everything

Disadvantages: homepage is crowded

IMDB or internet movie database is one of the most popular if not THE most popular movie website on the internet, it provides information on a huge variety of movies and celebrities - actors and acresses, you can see what movies an actor has been in and what movies he is set to be in. Any information about movies is here, what movie star was born on the day you visit the website is there, the latest photos from movie events such as the oscars.
IMDB is an amazon.com company.

IMDB is completely FREE. They recently made IMDB PRO this is for movie professionals who can subscribe to get even more useful movie information.

Just to demonstrate how HUGE the IMDB is you can get up to date statistics on imdb.com about how many titles it featues, today itis currently at 1,039,447

IMDB have also launched IMDB RESUME which allows you to get yourself discovered, its a perfect opportunity for budding actors/actresses. IMDB gets over 52 million visitors including movie experts who could further your career.

IMDB is very easy to use and navigate they have their navigational bar at the top and an excellent IMDB search engine where you can search titles, tv episodes, companies, biographies and much more!
IMDB is great for checking the latest cinema releases all over the world, the latest DVD releases, the information is quite detailed so you can use IMDB to find the rating for a movie and the age certificate.

Summary: IMDB is the best site of its kind