Source: Azzkiker from HL2Files.com via mail

Azzkiker from HL2Files.com informs me about a nice little file that can now be downloaded from his site. The file adds a handy menu to Half-Life 2 which enables you easy access to the multi player of the game:

This tiny file will edit your Half-Life 2 menu to add multiplayer options. Creating and browsing servers is now fully functional.

You can get the file from here.