AJAX:
http://programming-questions.blogspot.com/2008/04/ajax.html
JavaScript:
http://programming-questions.blogspot.com/2008/04/javascript.html
C++:
http://www.cplus-interview-questions.blogspot.com/
http://www.shettysoft.com/
C#:
http://programming-questions.blogspot.com/2008/04/c-interview-questions-1.html
PHP
http://www.kovasys.com/ForJobSeekers/ITInterviewQuestions/PHPInterviewQuestions/tabid/149/language/en-US/Default.aspx
Many:
http://www.globalguideline.com/interview_questions/Details.php?c=Basic_Programming_Interview_Questions_and_Answers
