Thank you notes and multiple interviews

I was contacted by a head-hunter. Made it through the first phone interview and in-person interview with her, and she sent my resume to the company looking for me.

Made it through the phone interview and in-person interview in DC. Before I left the airport, they asked me for a follow-up interview with the CEO, who would be in NYC (near me) yesterday.

That was called off due to the storm. I have been asked to come back in a few weeks (only time the executive team is all there). So I am siting down to write thank you notes. 

I interviewed with five people. Should I send thank you notes to all of them, or just the hiring manager?

I was only able to close on one of the folks I interviewed with -- the others caught me sleeping. The thank you note guidance tells us to re-close the deal, but I am reluctant to do it initially in a note.

My plan: close on  the others next time, and re-state the close to the CEO in a thank you note, and study like crazy about where they are, where they want me to take them, and have a whole new pile of questions.

Do I then send another round of thank you notes after interview 2?

What about if there is a round 3, do I need to begin buying bigger boxes of thank you notes (COSTCO?) ;)

Thanks,

Charlie

 (Btw, the close really, really needs to be an integral part of the questions.)