On Thu, 17 Sep 2009 21:12:14 +0100, The Natural Philosopher wrote:

isn't it 2.7 absolute or summat?

Sounds about right.

However on doing a quick web search that in fact
is the estimated current background temperature.

According to

http://www.advancedphysics.org/forum/showthread.php?t=8749

the posters there think the final temperature would be below 1 K.

And according to Wikipedia, any guess is dependent on whether one
uses a closed or ever expanding model of the universe.