When accessing a Windows (Samba) share most people will use a GUI. The GUIs are so nice these days, it just seems like the logical choice. If you happen to be at the command line, or just want to try something different, try smbclient. The command that I usually use is

smbclient //computer/share -U username

The command will prompt you for a password and then, if successful, you will be presented with a FTP-like interface. It's pretty nice and very simple. You can also use IP addresses instead of computer names. Be warned, this command knows nothing about NetBIOS name resolving (as far as I know), so if your Windows network has no REAL name resolving mechanism, you'll have to either put the machine in your hosts table or use the IP address.