I know I am speaking a bit out of topic, but it is important:
Amazon states that the kindle wifi does not support ad hoc network(peer to peer), so one cannot use his laptop to access internet. It means that one has to buy wireless router, which in turn could be quite an investment.
So there is my suggestion: use a virtual access point -
http://www.virtual-ap.com. Because i don't have a Kindle (yet), i can't try it. If somebody has already an experience with this programm, please share it! Greetings from Germany