Tidal wave links:

http://www.geophys.washington.edu/tsunami/welcome.html
This place has information about Tidal Waves.

http://observe.ivv.nasa.gov/nasa/exhibits/tsunami/tsun_start.html
This is a page from NASA that explains about tsunamis, and major ones that occured.

http://walrus.wr.usgs.gov/tsunami/
This site has information aobut how earthquakes and tsunamis are related to each other.

http://www.ccalmr.ogi.edu/STH/society.html
Tsunami soceity- it promotes awareness of tsunamis and has workshops, information, and more. (costs $)

http://www.tsunami.org/
Has information about tsunamis in Hawaii and the Pacific Basin (generally in the Pacific Ocean). Also has pictures of tidal waves.

More information about how/why tidal waves happen can be found [here]

More information about what a tidal wave is can be found [here]

Information about major past tidal waves can be found [here]

More tidal wave pictures can be found [here]