It's critical to put final updates on your Kickstarter page as it remains ranked in Google and may attract more customers after the campaign is over. You may also want to direct them to a private pre-order campaign on your site after they've read all about you and seen how popular your campaign was.
If you can send each of them a small token of support above and beyond what you promised them, do it! Even a hand written note to a particular funding tier or exclusive "Founding Customer Sticker"will make people excited to have been a part of the journey.