I applied online. The process took 2 months. I interviewed at Dynamic Logic (New York, NY) in Mar 2010
Interview
Quick screener followed by an onsite group interview with 6-8 other interviewees. 4 back to back 1v1s followed by lunch and then taken into another room to present a sample of their deliverable to several members of their staff.
Try to learn a little bit about their product and the way Internet advertising is run.
Interview questions [1]
Question 1
What do you know about online display advertising?