To add to this; a lot of providers use Smarty with their programs, they are definately nice to fool with and can give you a lot to play with as well (as far as scaleability goes); various *Nuke's utilize Smarty for their implimentations as well.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.
