I feel decently secure with my 128 bit wep key... and once I got my DS set up, I turned off Broadcast SSID... so now my WiFi is virtually invisable to the average person/device... Only devices that can use it, are the ones that already know its there. so thats kind of added security. =3
I would suggest most people do the same... At least its a comfortable way to stay secure... at most, set up filters so only your MAC addresses can use your WiFi... as well. ^_^;
And while I know WEP can be cracked... it most likely wont be... if a hacker wants to sit outside and force his way into your network... he probably will no matter what... same as any hacker on the net... but luckly most hackers dont want to bother with you... what you ARE protecting your self from, are WiFi theifs and your neighbors that dont know any better... If you keep your WiFi secure, at least they can't get in, since they wont know how to crack anything. XD