Get rid of server advertisements, skip forced waiting times like Pinion's Pot o' Gold and block server-own sound effects.
It's easy: Just download awesome mister Casual's Protect.cfg
and place it in your config file.
Step by setp: 1.
Create a new, empty text file named 'Exec protect.txt'. 2.
Copy and paste the text from here
into this text file. 3.
Save the text file, then change its ending from '.txt' to '.cfg'. You should get a notice about changing the file type might lead to the content becoming gibberish; pretend you know what you're doing and confirm that. 4.
Deploy the resulting 'Exec protect.cfg' file at your Steam/steamapps/"your username here"/teamfortress/tf/cfg folder. 5.
Close everything and [re]start steam. 6.
Try it out, go ahead and play a round of TF2 without being bothered by any server-side annoyances.
Further information can be found here
and also here's a video step-by-step tutorial on how to install Casual's 'Antivirus' on your 'puter:http://www.youtube.com/watch?v=VM0RX-ehKsc