As many people have pointed out Left4Dead actually shipped earlier than the 21st for those in the US so rather than delaying till the anniversary of the Europe release date L4DStats is available as of midnight!
See all available downloads here: http://www.l4dstats.co.uk/download/

Since its so close to the 1 Month anniversary of Left4Dead’s retail release I’ve set the release date for 0.3 to be the 21st of December 2008.
0.3 fixes a lot of issues people found with setting up the website, parsing logs and slowness for large databases (some dedicated servers running up 10,000 kills a day!) [...]

At 22:00 today the latest Beta of L4DStats was sent to the testers.
Assuming no show stopping bugs are found the public release and SVN repository will be open to everyone!