Visit the Official Site

Behind the Scenes:
Second disc:
Access "Making the Amazing" from the main menu. Press up to see a behind the scenes clip of Sam Raimi, Alfred Molina and William Dafoe.
Reported by: Bee

Bonus Feature:
Insert Disc 1.
Go to "Special Features", your Enter button.
your Enter button Commentaries.
Go to Technical Commentary Off.
Click RIGHT arrow once, then UP arrow once and it should highlight a hidden spider. your Enter button.
Takes you to a Japanese Press Introduction by Director, Sam Raimi, months prior to Spiderman 2's completion and theater release.
Reported by: Wookiee

Bonus Feature:
Select gallery and go to proceed. Push up and then press your Enter button to view a little song and dance number by Alfred Molina.
Reported by: Vidar Sandes