the url that google talk likes to go to :
http://desktop.google.com/download/googletalk/google-talk-versioncheck.txt
And guess what is there?
Well, I got this :
Version: 1.0.0.64
URL: http://desktop.google.com/download/googletalk/googletalk-setup.exe
Launch-Action: execute
Launch-Target: googletalk-setup.exe
Launch-Parameter: /S upgrade
Description: Google Talk Update
Signature: 2d126a7c47a250a1a774311f79535cd2d905c9a04c2f67dbe7d577fc7ae245f33fb79e315fa617fc766212fe2866d92bf42781fdc038e6d5bc001fb131327cae5db4c315ccdc9d4c2985d47d3c779b14188a66d0486d2ee06bd1bf37f49d4499a8df30cd7b5ea8162cdbc99f02de91c778bc476d5dacb84c97ee4504d94da26fa087fcd7d0075a94897a61bb5af3a670fd5be4d27c8e945ca23054f56263024385ca40d2426152b41cd78fb88128fa31f954d0c19272fe82fd7bb63457a26d7c