I'm sure there's somewhere online that I could watch it, but I don't really enjoy watching whole shows on my PC.
All the episodes (including the pilot) are available to watch in full on the QI YouTube site: HERE.
And I know it works in the US because I've watched it online while I've been there.
I know watching on a PC is not the ideal thing to do, but it's certainly an option.
We have a friend in Tucson who is hooked on it.