I have found this site useful for other reasons but it can be used to find related staock in a sector. http://www.equitytrader.com The site is run by John Bollinger of Bollinger bands fame.
Use these two: http://money.cnn.com/technology/techstocks/ http://www.mobydata.com/comp.htm trade on, ken
I am not sure ... try the free trial perhaps ... should be no obligation just make sure you do not have to give credit card info on the free trial