A detailed look at Vancouver's startup scene (montrealtechwatch.com)

I don't think so. I think you can come for a short time to the US with no problem. It's staying for years that's hard.

SocialPicks is incorporated in Delaware. To attend YC's SFP '07, I applied for a 4-month TN Visa at a port of entry (Vancouver airport) en route to Cambridge. More info can be found at http://travel.state.gov/visa/temp/types/types_1274.html