Two more previews of Team Fortress Classic are online as Valve and TeamFortress Software tour around showing off this upcoming free multiplayer-only add-on for Half-Life. Here's PC.IGN.COM's TF Classic preview, and here's GameCenter's TF Classic preview. If you're unfamiliar with TeamFortress (originally developed for Quake, here's the Team Fortress Home if you want to check that out), here's a concise summary from the PC.IGN.COM piece:

Players take on the roles of different character classes--soldier, medic, demolitions expert--and work together to defeat the opposition. Each class has its own strengths and disadvantages...