Has anybody else gone to Canada on a working holiday visa and travelled to the US throughout it?

My partner and I will be going to Canada on a 2 year Working Holiday Visa and want to travel through the US intermittently as we earn the money. I know I can't go through on a visa waiver because I will be in the continent for more than 90 days, but to be eligible for the B1/B2 visa, you need to prove you have a residence to go back to, etc and we wouldn't have that. Are there any other Aussies, Brits, etc who have done something similar and can help? How do the US know when you leave? Thanks in advance.

Of course you can use the Visa Waiver Program to travel to the United States for up to 90 days if you hold a passport of one of the 35 visa-waived countries.
http://travel.state.gov/visa/temp/without/without_1990.html#countries ..
If you plan a flight you will need a prior approval (ESTA) by the U.S. Department of Homeland Security which can be obtained free of charge on their website.
http://www.cbp.gov/xp/cgov/travel/id_visa/esta/ ..
If you enter by a land border you will have to obtain a Form I-94W at the border for a fee of $6.00 which must be presented to the U.S. immigration officer who decides for how long you may stay. When you get back to Canada and you do not plan to re-enter the United States during the duration of your granted visa-waiwed stay, just turn back the green form to a U.S. border guard on a land border. If you fly the aircraft company will take care of that.
http://www.cbp.gov/xp/cgov/travel/id_visa/business_pleasure/vwp/i94_samples.xml ..
Just in case your travel plan changes and you do not plan to re-enter the U.S. but still have the green form in your passport please follow the instructions on the attached link.
http://london.usembassy.gov/dhs/cbp/i94.html ..

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