Client: http://www.mediafire.com/download.php?qia7vxmc051ogkz
Server: http://www.mediafire.com/download.php?mxhjmeol7xt25ln
Jenkins/Source: http://lexmanos.no-ip.org:8080/job/Forge/171/
After installing it, replace cpw/mods/fml/server/FMLServerHandler.class in the server jar with this or the fix won't work:
https://dl.dropbox.com/u/861751/IC2/FMLServerHandler.class
It isn't a recommended build yet, Lex is busy this weekend and will promote it to recommended as soon as he can get a build post done.
The next patch (for 1.2.5 we promise!) will require it as well as a safety measure.