When do IBs start contacting people for interviews?

now

are you sure since a lot of them say they are still going to be taking resumes until mid october?

starting now, until whenever they fill their class, which could be as late as next spring

ah gotcha

What are the usual deadlines for applications (both full time entry and summer analyst?)

from what i've seen end of october is the deadline for most banks

Well on campus here at McGill (even though we aren't anything like Harvard) interviews are full speed away. Goldman and Merrill just had their first round this past week with us.