PURE IS COMING !!!!!!!!!!1111111111
this is THE biggest news all year - valve are allowing server owners to force CRC checks on all client files to make sure they are the same version - this includes:

- Skins

- Models

- Textures

- Sounds

from the man himself:
"Server can now force the client to match the server's files. If the server sets sv_pure to 1, it'll load pure_server_whitelist.txt from the game path, which specifies sets of files that are allowed to come from Steam, allowed to come from disk, and require CRC checks.

When the client connects to a server and receives the whitelist, it reloads resources that may be "dirty" (like the client loaded the file off disk but the server only allows the file to come from Steam).

The server can set sv_pure_trace to show which files clients are requesting CRCs for. By default, the server will just show a warning when a client has a mismatched file. If they set sv_pure_kick_clients to 1, then the server will kick clients that have mismatching files."

Thank You Value - FINALLY!