sudo mount -t smbfs //username@windows.home.example.com/Shared /Volumes/Shared
The /Volumes/Shared directory needs to exist. Change to fit your network.
Use Finder. You're probably familiar with this, but for the readers at home :).
Select Finder (clicking the desktop works) Command-K will bring up ""Connect to Server"" dialog. Type in the URI, for the above share: smb://username@windows.home.example.com/Shared, it will automatically mount on /Volumes/Shared. Click the (+) plus button to add to the favorites list. Connect.
Also, the ""clock"" button next to the plus will show recently connected fileshares.
Bonus! Not really a method, but something you should do so this doesn't need to be done every time you boot.
Open Account Login Items: System Preferences -> Accounts -> Login Items (or spotlight search for accounts). Click the (+) plus below the main dialog. Navigate to the share you just mounted, under 'Shared'. Click ""Add"". Uncheck the ""Hide"" box on the main dialog, unless you want that folder to open every time you log in."