Nmap

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nmap allows you to find out what network ports are open on your system:

itchy:~ # nmap localhost

Starting Nmap 4.75 ( http://nmap.org ) at 2009-04-06 23:38 EDT
Warning: Hostname localhost resolves to 2 IPs. Using 127.0.0.1.
Interesting ports on localhost (127.0.0.1):
Not shown: 996 closed ports
PORT    STATE SERVICE
22/tcp  open  ssh
25/tcp  open  smtp
111/tcp open  rpcbind
631/tcp open  ipp

Nmap done: 1 IP address (1 host up) scanned in 0.28 seconds

See also