The unstable/testing/stable monikers aren't indications of the stability of the program...more the newness of the Debian package itself. 7.2 will move into testing 2 weeks after it's been uploaded to unstable (barring any bugs in it or dependent packages). Shouldn't be long now. Or, if one is brave *grin*, you could just set your apt preferences to include unstable at a lower priority than testing, and then "apt-get -t unstable postgresql". That'll get postgresql and any necessary dependencies out of unstable directly, w/o having to move your whole distribution up there. I do that on my desktop box with the KDE2 packages, for example, to keep up to date.