Old company H1B stamped. Visiting Canada. Do I need to get stamping done again ?

[hsriniva]

I was working for company X until Dec 15th 2009 and have a valid H1B visa stamped on my passport valid until jun 2011.

I joined another company on Dec 16th 2009 and got my H1 transferred.
I want to visit Vancouver, Canada from Seattle for a couple of days on Jan 1 2010 - Jan2 2010. Do I need to get my visa stamped in Canada again?