so upgraded to latest version of nmap and it will now give you TNS listener versions. I couldnt find the exact build where this started but its certainly handy.

C:\Users\CG\AppData\Local\msf32>nmap -sV 192.168.73.132

Starting Nmap 4.76 ( http://nmap.org ) at 2009-06-27 10:33 Eastern Daylight Time

Interesting ports on 192.168.73.132:
Not shown: 992 closed ports
PORT STATE SERVICE VERSION
80/tcp open http Microsoft IIS httpd
135/tcp open msrpc Microsoft Windows RPC
139/tcp open netbios-ssn
445/tcp open microsoft-ds Microsoft Windows 2003 microsoft-ds
1025/tcp open msrpc Microsoft Windows RPC
1028/tcp open msrpc Microsoft Windows RPC
1047/tcp open unknown?
1521/tcp open oracle-tns Oracle TNS Listener

MAC Address: 00:0C:29:2E:0C:4D (VMware)
Service Info: OS: Windows

Host script results:
| Discover OS Version over NetBIOS and SMB: OS version cannot be determined.
|_ Never received a response to SMB Setup AndX Request

Service detection performed. Please report any incorrect results at http://nmap.
org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 131.42 seconds

C:\Users\CG\AppData\Local\msf32>nmap -sV 192.168.73.132

Starting Nmap 4.90RC1 ( http://nmap.org ) at 2009-06-27 11:10 Eastern Daylight T
ime
Interesting ports on 192.168.73.132:
Not shown: 992 closed ports
PORT STATE SERVICE VERSION
80/tcp open http Microsoft IIS webserver 6.0
135/tcp open msrpc Microsoft Windows RPC
139/tcp open netbios-ssn
445/tcp open microsoft-ds Microsoft Windows 2003 microsoft-ds
1025/tcp open msrpc Microsoft Windows RPC
1028/tcp open msrpc Microsoft Windows RPC
1047/tcp open oracle-tns Oracle TNS Listener
1521/tcp open oracle-tns Oracle TNS Listener 11.1.0.6.0 (for 32-bit Windows) <--version info
MAC Address: 00:0C:29:2E:0C:4D (VMware)
Service Info: OS: Windows

Service detection performed. Please report any incorrect results at http://nmap.
org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 99.35 seconds