A couple of interviewers ask me this question.
Please be specific about your query - you'll get much better answers.
Is this a knowledge question or an interview tactics question? In other
words, are you looking for ways to learn about JSP, or are you looking for
ways to communicate to an interviewer who asks an open-ended question?
Even i have more than 2 years experience, I don't know where to start.
Well, that's a problem. Experience is useless unless it generates knowlege
and understanding. Do you not know anything about jsp because your
experience is in something else, or do you know something and don't know
where to start describing your knowledge?
Can anybody point out the important ones?
http://java.sun.com/products/jsp/ is the first place to start. There are tons
of books as well.