Wait until tomarrow (Monday) because McAfee is gonna release a Wi-Fi security program that looks pretty interesting. It's getting released on their website Monday then next month in stores.
Here's a link about the program -
http://www.pcworld.com/news/article/0,aid,122223,00.asp
They say that the program will automatically set up encryption keys on Wi-Fi routers and the PCs connected to them and then rotate the keys every three hours. I think that's pretty damn secure.