I bet everybody out there went at least once to the interview. There are many sites which could help you with preparation and even though I haven't went to any at least few months, i check some questions sometimes only for fun and to improve the creativity and expand the knowledge.
C programming questions and answers [indiabix.com]
0x10 best interview questions [rmbconsulting.us]
I consider this as a classic in my eyes. I remember i run into the 0x10 list when i was not able to answer few of those if not all :)
Glass Door [glassdoor.com]
This one is a bit different, it contains information about the salaries, job interview questions for an exact position. Worth to register and check it out!
I'll expand this list by time.