Yeah I hear that. Oh wait...I just found this. I am going to try this tonight
However, one of the cool things about both Valve and its Steam service is that Valve can quickly issue patches for their games and they have done just that for Left 4 Dead. If you want the traditional server browser you can now access it via the developer console. In the menu access Options, then Keyboard/Mouse, and then enable the Developer Console. After that hit your ~ key on your keyboard which should enable the dev console. After that type in "openserverbrowser" and you should see what's in our screenshot; a very familiar looking server browser.
http://news.bigdownload.com/2008/11/07/left-4-dead-patch-adds-optional-server-browser/