Release notes:

This will allow your elgg site to login using Google Friend Connect..
Installation instruction is available inside the package or
you can go to gfc development site

live demo can be found here
 http://elgg-gfc.arunoda.com/

Works with both 1.5 and 1.6

Installation guide 
 http://code.google.com/p/elgggfc/wiki/HowToInstall

Changes since 1.1

• Select a human readable username for user account(AJAX Interface)
• Ability to login using native login system
• GFC User validation system for private sites.. (AJAX Interface)
• GFC login icon alignment via UI
• Remove unwanted javascript loading from google
• Control features with GFC administration UI
• Better icon handling
• Backward compatibility with older versions
  complete change log

NOTE: Now GFC no longer requires you to upload some files the the root of the site (previously  rpc_relay.html & canvas.html)

DOWNLOAD the latest 
following package contains latest version of the plugin (with fixed bugs discussed here)
http://elgggfc.googlecode.com/svn/trunk/elgg_gfc_trunk.zip