We are the Xfire clan for Toady One's fortress-making/adventuring Roguelike Dwarf Fortress.

Reminder: To get Xfire to track Dwarf Fortress, you have to manually find the DF entry in the Games tab of the Options.

To do the same with the Minecraft Alpha downloadable client:
Edit xfire_games.ini (in ProgramData\Xfire on Vista/Win 7, unknown for XP) and change its entry to the following.
[6216]
LongName=Minecraft
ShortName=mcrft
LauncherExe=minecraft.exe
DetectExe=javaw.exe
Launch=%UA_LAUNCHER_EXE_PATH%

Restart Xfire and then you'll be able to manually detect Minecraft.exe and your Java installation.