Those protectors will block:
1)Old CS-DOS attacks
2)Fake-Players CS-DOS exploits(found by Luigy)
3)FuF's "Burn to be pig" exploit and its unofficial modifications(found by FuF)
Both solutions have options of advanced logging to catch those bastards using the exploit and if you want you can pursuit a case against them later. Also there is possible option to send custom message to an attacker.
SteamClient Emulator For Source 2007 Engine - REVOLUTiON
NOTES:
This one intended to be used on Source 2007 engine clients.
It will enable serverbrowser and disable clientside protections.
Future versions will allow unique ID's too.Stay tuned in appropriate topic.
Dont use it on server.