Are you using WEP or WPA encryption? WEP: not secure. WPA: secure. If your ISP only provides WEP wireless routers, buy your own wireless-G router. It's worth the 50$ for a feeling of security. If you don't mind spending a little more, wireless-N is the way to go!
Are you using mac address filtering? If not ask your ISP to walking you through the set up. Mac address (machine address) is a computer specific address. If you enable mac filtering, only machines with certain addresses can jump on your network.
Do you have your SSID broastcasting? (That means can you see the name of your network in "view wireless networks.") It's not secure to broadcast you SSID. You can find it if you know the name.
Even if you set up mac address filtering and disable SSID broadcasting, you still need to make the switch to WPA. WEP crackers take less than a minute to crack a code. There are tools to find SSIDs that aren't broadcasting. The best way is to switch to WPA encryption.
Are you using the default password on the box that your internet provider gave you? Uh, don't.
If you suspect someone is stealing your wireless, download this: http://zamzom.com/. You'll find out in a jiff!
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