Internet Movie Database

Did you ever watch a movie and thought you recognized one of the actors? Didn't she play in ...?
The IMDB - Internet Movie Database, allows you to search it's entire movie collection by either movie or actor name and see all relevant information on it. Just yesterday, I watched a movie named "In her shoes" and after running a query in IMDB on one of the actresses it turned out that she starred in a 1994 movie named "Muriel's Wedding".
Use it when in doubt or just track your favorite movie stars.