For the guys missing the old LookingForGroup function that got axed, this Addon might perk you up.
LFGX by jtbalogh should help fill in the former function's shoes, which appears to be an approximation of the old LFG. It also works with LookingForGroup and General channels, so it should not interfere with you basic functions.

As for the further details by the author:

* The default Blizzard LFG server is optional and not required.
* This addon will import all 'Looking for More' requests from the server.
* Button mashing is needed since it can not be automated, so periodically press a few times the slash /lfwx, the keybind, the minimap button, or 'Refresh' button in the Lfmx tab.
* Sending requests is not implemented because broken by patches, so use the original Blizzard LFG server for now.

Instructions:

1. Run /lfwx to open window, or use keybind, or use minimap button
2. Open one or more chat windows for optional viewing
3. Join the LookingForGroup or General channels in any chat window
4. Enable the Blizzard server in options, if desired, and do button mashing.
5. See tooltips around the interface for additional help
6. (see warning below)

WARNING: Disable other addons that may temporarily block/hide messages in those public LFG chat channels and log back in. This addon is more useful when channels remain visible, showing the original message in the original channel without having to block anything. This addon makes every attempt to make the LookingForGroup channel end up looking and being used like it always did before being nerfed -- plus a few features notwithstanding.

Test and try sending some requests for update only and add comments like, 'just testing, no need to respond'. Test public channels with care though since test messages annoy people. If you are not comfortable using an addon to send requests to public channels, you could use the slash command to chat as usual. Or just wait for people to start talking in the channels.

Command:

* /lfwx (toggles through all of them quickly)
* /lfgx
* /lfmx
* /lfcx

Options:

* See the Wizard window for the option button

Install:

1. Move the files to the game folder, .World of WarcraftInterfaceAddOnsLfgx*.*
2. Enable the blizzard option for "out-of-date" addons before entering the world. There are too many patches by Blizzard this month to bother updating the toc file.

Uninstall:

1. Remove the game folder, .World of WarcraftInterfaceAddOnsLfgx*.*
2. Leave any unused channels, like Lfgx, LookingForGroup, General. The public channels are not hidden by this addon and easily visible to avoid confusion. Only Lfgx is hidden.

Credit for the original LFGX interface, FrameXMLLFGFrame.lua, goes to Blizzard. Some features incorporated from addons; ArcaneLocate, Atlas, JoChatTimeStamp, MonkeyQuest, PlayerRating, QuestHistory.

Known bugs: some, not yet mentioned here
Known limitations: The addon relies on channels and peer-to-peer communication, so there are limitations.

ChangeLog:

Revision 1.03
(Major change) Fixed tables to remove requests from tables in real time. Option was accidentally turned off and left requests in table to just expire.
(Major change) The addon can import player information from the default Blizzard LFG interface (requires button mashing though)
Updated xml minimap button dropdown position to stay on left if possible. Previously right of button sometimes.
Added tooltip to Lfcx listbox
Fixed carriage returns in code caused by conversion.

Revision 1.01
No big changes, just removed some test information.

Revision 1.0 First Release version 1.0