Strangely, I'm more excited this morning than when HL2 came out the other week, as there are 3 great pieces of news to mention.
First of all, HL2DM has been released, which comes with 2 maps and gravity gun goodness. And apparently it's awesome.
Also, the full SDK has been released, and it comes with HL2-compatible-Hammer and various modelling tools.
And combining the two, Valve are holding a
map making competition with a top prize of $5000. Feel free to put up your entries-in-progress on this site :wink: