This is a wonderful site from the University of Salford in the UK. Listen to soundscapes which have been recorded all over the world. Navigate on the map to find a place of interest, listen to the recording and read the information about the location. Upload your own soundscapes using the site or download the iPhone and iPad app at https://itunes.apple.com/app/i-say/id516927213. It's a useful geography resource and should get your students thinking about the sounds around them.
http://ictmagic.wikispaces.com/Music%2C+Sound+%26+Podcasts
I love this site. A set of sound scapes of relaxing and fasinating scenes. Edit and add sounds by signing in. A superb resource for creative writing and setting a mood in your class.
http://ictmagic.wikispaces.com/Music,+Sound+&+Podcasts
This has many good sounds. Do not just give to students to explore for a project though. If you listen to the sounds in the Skits and Comedy section you will understand.