I never did with pwc, but I assume they're pretty much the same. I did with DT, behavioral of course.

The following discussion board has many good info. for big4 interview. Most people there are big4ers or interns.

http://www.accounting.com/forum2/forum_posts.asp?TID=5213&KW=interview

http://www.accounting.com/forum2/forum_posts.asp?TID=3912&KW=interview

Really no need to worry, believe me (although I know you don't :p). As long as you behave professionally, don't make big mistakes (like I did once), you'll be okay. Good luck!

Besides, you really need to know more about PWC as possibly as you can.

The vault message board helped me a lot when I interviewed. And this is vault PWC message board:

http://www.vault.com/community/mb/mb_main.jsp?forum_id=5842&ch_id=253

Click "company home", you'll see their employees talking about PWC, salary range, how they did the interview, etc.