Programming lovers

http://stackoverflow.com/ -->ask questions get answers within hour by experienced programmers--its like orkut for programmers
http://projecteuler.com/ -->take challenges of programming , optimization
http://techtarget.com/ -->techdownloads
http://www.yfrindia.com/ -->for online tests

http://www.codeproject.com/

http://www.sourcecodesworld.com/

http://www.codeguru.com