Well, if you tell INS at the border that you heading for an interview, they will deny you entry with 100% certainty. There is no way they will let you in the country if they even suspect that you are heading to the States to look for work. If they even suspect that you are currently unemployed, they will deny you entry as well. The mindset is that you are taking jobs away from Americans, and naturally, they are very protective of their citizens. Off the record, you would need to do the following: Tell INS that you are visiting a friend or relative or just vacationing. Interview at companies who are aware they will need to sponsor you for a work visa, either
TN or H1B. Secure a valid job offer and paperwork from the firm. Head back to Canada and then apply at the border for a work visa.
My advice to you is to send out resumes and cover letters explaining your situation. Arrange a bunch of interviews around the same time frame, and then head down. INS has a record of your entry and departure dates, so they will start questioning you if you make very frequent trips to the States without a valid work visa.