samba 3:2.3.2-1ubuntu3.5 is the answer.
Here's how it goes...
1. Close synaptic if you have it open
2. Go to System: Administration: Software Sources
3. Select updates tab
4. Check 3rd and 4th check boxes (intrepid-proposed & intrepid-backports) if they are not already checked.
5. Close software sources dialogue and click 'Reload' in dialogue that pops up to include the new sources in Synaptic.
6. Open synaptic (Go to System: Administration: Synaptic Package manager)
7. Type 'Samba' in the quick search box and press enter
8. Find 'Samba-common', 'smbclient' & 'libsmbclient' in the list of results. They should all be marked with a green box and a star to a show they are installed but a newer version is available. The newer version should be marked 3:3.2.3-1ubuntu3.5.
9. Select these packages for installation, accepting any dependencies and then apply the changes.
10. When they are installed, close synaptic and go back to the software sources and remove the intrepid-proposed & intrepid-backports sources to prevent the system inadvertently applying unapproved updates.
Hopefully you can now use Nautilus to connect to your smb share. (Places: Connect to server)