Send an email to all your friends and family stating that you will give away $1 USD in bitcoins each day for the next 30 days to this email list.
Give them instructions on how to download the clients (point them to BitcoinIntro.com if they are a noob).
Then, each day, send $1 in Bitcoins to an instawallet address and post the URL to the email list.
It doesn't have to be Instawallet, but it's the most intuitive interface for noobs. If you have a higher class of friends, then post private keys, or do some simple xor on them as a puzzle.
It doesn't have to be this specific amount, or frequency. It's just meant to light another fire under Bitcoin.
Post your experiences.
Heh, I posted a similar idea a couple hours ago. https://bitcointalk.org/index.php?topic=52295.msg624013#msg624013
I would use key pairs like bitaddress.org
and pique theircuriosity.