SMBUp re-instates Samba as a service of your mac and provides a simple interface to manage the service.
NOTE: The application is donationware. A reminder will appear upon startup once a day; it can be dismissed by checking the donation checkbox. The checkbox is based on the system of honor: It won't do any verification on whether the donation has effectively been made.
Keep in mind that while the application will allow you to create users for accessing authenticated shares it will only warn if those users have more than 15 groups assigned to them, even though OS X Lion won't allow such users to authenticate properly. Make sure you edit those users' groups to reduce their number.
The application is not crippled in any way if no donation is made, although donations are appreciated as they help us continue improving the software and providing new tools
NOTE: SMBUp installs Samba, which in turn replaces Apple's OS X's native netbios and SMB services. This means that while connecting to servers from the Finder remains functional, the Finder won't be able to "browse" network services and servers from the network won't show up in the Finder's sidebar. Be advised.