This command will mount a windows share on Ubuntu 10.10 (and obviously other versions):
sudo mount -t cifs //1.2.3.4/ShareName/ /media/share -o username=yourUserName,password=yourPassword,allow_other
"1.2.3.4" - The name of the server with the share
"ShareName" - The name of the shared folder
"/media/share" - The local folder the share will be mounted to
"yourUserName" - The username for the share
"yourPassword" - The password for the share
If you don't have a password, you really should have one for security but here is the command anyway:
sudo mount -t cifs //1.2.3.4/ShareName/ /media/share -o allow_other
If you get the error:
mount: //1.2.3.4/ShareName/ is not a valid block device
Then you may need to install samba file sharing:
sudo apt-get install smbfs
Linux/Ubuntu Samba