California
Colorado
Idaho
Kansas
Missouri
Nevada
Oregon
Pennsylvania
Virginia
Washington
Wisconsin
Wyoming
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British Columbia
Alberta
Iceland
*South Dakota will be added in August. New York or Ontario may be added in October. Arizona would have been added in February 2008, but that was scheduled just a few weeks after my horrible ankle injury. However, we ended up using the resulting airfare credit to a trip to Hawaii in April of 2008, which was my 50th state visited, so that was worth something!
Massachusetts
New Hampshire
Connecticut
Rhode Island
Vermont (ski-O)
New York
Pennsylvania
Maryland
North Carolina
Georgia
Kentucky
Ohio
Indiana
Michigan
Wisconsin
Missouri
California
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New Brunswick
Estonia
Sweden
Switzerland
France
Germany
I arrive at 17 states, though it's a little easier for me out East, as our states are small.