Short List
mp_disable_respawn_times X (1/0 instaspawn/not-intstaspawn)
mp_respawntime X (x seconds)
mp_teams_unbalance_limit X (0 for disable)

mp_timelimit X (x minutes)
mp_winlimit X (x wins)
mp_maxrounds X (x rounds)

sv_alltalk X (1/0 on/off)
mp_friendlyfire X (1/0 on/off)

mp_restartround X (in x seconds)

rcon tf_weapon_criticals X (1/0 on/off)
tf_damage_disable_spread X (1/0 off/on)

mp_tournament X (1/0 on/off)
mp_torunament_restart

rcon users
rcon kick X (kicks player x)
rcon kickid userid/uniqueid "message" (this kicks player; userid = first 2/3 digits in 'rcon users', uniqueid = steam id)
rcon banid minutes userid/uniqueid [kick] (This bans the player for minutes. see kickid for id details. kick is an optional param, if used it will also kick the player. Use 0 minutes for permanent)
rcon unbanid X (this unbans the id)
rcon addip minutes X (bans IP address for minutes specified. Use 0 minutes for permanent)
rcon removeip X (removes IP ban)




http://developer.valvesoftware.com/wiki/Console_Command_List