I recently arrived in Canada, from New Zealand, and I've been looking at how to migrate to the US - preferably without going through the usual heavy application-fees and pain-in-the-ass interviews.
I've just found what I consider to be the most convenient way, by far. Those with Canadian or Mexican citizenship and who fit the list of professions here can gain three-year work eligibility with virtually automatic extensions, by way of the TN Visa (from NAFTA): http://www.consular.canada.usembassy.gov/nafta_professions.asp
All one needs to do is obtain a letter from an employer confirming a job offer, bring evidence of professional qualification(s) and citizenship, and pay $50 at the border (no fees, paperwork, or interviews prior to entry).
Here is the wikipedia site, which seems to fit with the US Consulate information.http://en.wikipedia.org/wiki/TN_status
Fortunately, I have Canadian citizenship, so all I have to do now is find an employer willing to hire me under the title of "economist," "technical publications writer," or "research assistant." Anyone with suggestions on suitable employers in NH, don't hesitate to PM me.