Websites
There are two great Harry Potter fan sites out there, the first of which is MuggleNet. Mugglenet hosts forums and news about the all the latest in the world of Harry Potter.
The second huge Harry Potter fan site is The Leaky Cauldron. Definitely worth checking out!
Any questions about what, exactly, a basilisk is? Or how Araminta Meliflua is connected to Phineas Nigellus? This site is the place to go, an encyclopedia with useful subject headings to guide your browsing.
Harry Potter Wikipedia, with entries on pretty much everything you can find in the books. Looking for a picture of Gregory the Smarmy? Try here.
Nice notes on Joanne Kathleen Rowling; it has a bare bones design, but is filled with helpful information.
Movie or TV Productions
This was the second Harry Potter film directed by Chris Columbus, who also directed Harry Potter and the Sorcerer's Stone (2001).
Documents
Basically the go-to source for all direct quotes from J.K. Rowling on Harry Potter's world. It really doesn't get much more comprehensive than this.
Video
Watch the trailer for the 2002 film.
There's a computer game of Chamber of Secrets; now, thanks to YouTube, you can get to the end without bothering to play all the way there.
And you can check out the trailer for the game here.
Be sure to check out part 2 as well!
Audio
Takes place in 1999 after the American Release of Harry Potter and the Chamber of Secrets.
Images
A photo from the movie with Daniel Radcliffe as Harry and Richard Harris as Professor Dumbledore.
Another photo from the film, this time with Lockhart (Kenneth Branagh) facing Harry and Ron Weasley (Rupert Grint).
Hermione Granger (Emma Watson) making Polyjuice Potion.
Man, Daniel Radcliffe looks so young!