I read a really cool article about iPhoto and sharing your pictures via the network at school. Using this strategy will allow everyone on your grade level to easily add, delete, and modify photos. 
 
(1) Open iPhoto and click on the iPhoto pull-down menu at the top. 
 
(2) Click on Preferences and select the Sharing tab at the top. 
 
(3) Place a check in the box next to Look for Shared Photos and Share My Photos. 
 
(4) You can either share a Library (Collection of Albums) or specific Albums within a Library. 
 
(5) You can also create a name and password for the Library or Album you decide to share. 
 
These same steps can also be performed in iTunes to share your music with everyone.