Stingator:

Are you referning to establishing a secure network like https or are you asking about how to setup your wireless network so that it is more secure?

Assuming the latter (keep in mind that nothing is totally secure if someone has the proper equipment, money and determination):

1) Don't broadcast your SSID

2) Change your SSID periodically (say every month or so).

3) Enable encryption

4) For for security, setup a VPN.

5) If you wireless router allows it, restrict users by allowing only certain MAC addresses.

You can do any combination of these.

-Mike