If someone has your wireless info..

[david]

I mean everything, wep, sys pass, s/n, how much damage could be done hacking and privacy wise?

 

[Galeongirl]

They could log into your router info and change the password, configuration and such and you wouldn't have access to your own internet anymore.

 

[Liesje]

Pretty much anything could be done depending on the person's level of expertise. You can use a packet sniffer to figure out the encryption and decrypt all the traffic going in/out, for starters.

 

[Chrisedge]

They could access the log and see all the sites you visit...