I applied through an employee referral. The process took 6 weeks. I interviewed at ExxonMobil (Houston, TX) in Nov 2011
Interview
Is different, it all depends on the position, location, and luck.
You never know what they are going to ask, who's going to do the interview. You better know people inside for higher positions, otherwise HR will be in charge for entry level positions, and is a very general random process.
Interview questions [1]
Question 1
What do you know about ExxonMobil
What do you did in the past that is relevant to the applied position
What are your expectations
Tell me what you know about your field