I've just got my N9, and been trying to install gtalk to no avail. The store option fails. Doing it manually through a terminal I am getting something about call-ui and package-manager not being the right versions (call ui > 4.2011.10.21+0 and I have 3.2011.09.12, package-amanger > 1.2.9 but I have 1.1.4) however trying to manually update these (apt-get install) even after a apt-get update is not working either. Any ideas?