well tfp is usually pretty good for asking questions.
http://www.codeproject.com
http://www.codeguru.com
http://msdn.microsoft.com
http://www.gamedev.net
http://www.delphi32.com
really it depends on what you are looking for, the best places are generally the email lists, since thats where a lot of the manufacturers and pro developers hang out, unfortunately due to a lot of offtopic and other such stuff, they tend to go invite only or underground so to speak.