Mandrake 8.0 security question:

I have an 8.0 box I'm about to put on a Roadrunner cable connection for the first time. I set the security option to "high" and firewalled off pretty much everything (web server, telnet, SSH, POP3, etc). The box is going to be plugged into a SMC wireless router with a firewall on it. I'm just going to use it for web browsing and basically farting around.

Is there anything else I need to do to the mandrake box before I put it on the net? I don't want to get 0wned.