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However, just like on a wired network, without encryption... it is easy to sniff and see what you're doing. So... since your data is flying over everyone heads you may want to have your own encryption. If you are not worried about people seeing what your normal traffic is... then don't worry about it. Your secure sites should be encrypted using SSL anyway.
If your talking about securing your computer against other wireless attacks, the obvious stands as everyone else has mentioned, ie firewall etc etc etc
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TELNET, FTP, POP, RLOGIN, SSH1, ICQ, SMB,
MySQL, HTTP, NNTP, X11, NAPSTER, IRC, RIP, BGP, SOCKS 5, IMAP 4, VNC,
LDAP, NFS, SNMP, HALF LIFE, QUAKE 3, MSN, YMSG
(and yes, it was from the man pages of ettercap :P)