Besides the GameRanger solution there are currently 2 tools available to solve the problem. Both act like the original server browser for the client. But they are slower and the server has to be added once manually (preferably by the server hoster; once the server is registered, it's visible for all clients using this corresponding tool).
tool made by {USSP} DExUS: http://uac.ac/#news
(this one works a little bit better in my eyes)
plugin for swat-downloader made by |VOWS|Desrat: http://desrat.lightning-bolt.net/update.html
Also MarkieBoy is working at a mod with a new ingame server browser, this could be a nice solution in the long-run but will require some time to get finished: http://forum.markmods.com/index.php?topic=2860.150Added (21/10/2012, 5:54 PM)
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*update*
MarkMods has released an update for GEZ and Mark Mod to fix the query problem: http://forum.markmods.com/index.php?topic=2889.0
(I didn't tested it yet, will have a deeper look at it later.)
Added (23/10/2012, 7:14 PM)
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The new MarkMods Master is working, but all clients need to install a patch to make the in game server browser working: http://forum.markmods.com/index.php?topic=2898.0
(is still a beta version though)
Added (13/12/2012, 5:12 PM)
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Seems like we have to use xfire and the MarkMod-Serverlist-Patch for the future. The GameSpy Masterserver won't come back, and gametracker isn't working again yet.
Btw found a nice article in the SAS forums: http://www.sasclan.org/modules....hlight=
(although I'm not sure how reliable the author of the article is; direct link: http://games.slashdot.org/story....warning )