Well now its easy.....and free.

QuoteJanuary 29, 2008 – Valve, creators of best-selling game franchises (such as Half-Life and Counter-Strike) and leading technologies (such as Steam and Source), today announce Steamworks, a complete suite of publishing and development tools – ranging from copy protection to social networking services to server browsing – is now available free of charge to developers and publishers worldwide.

http://www.steampowered.com/v/index.php?area=news&id=1423&cc=CA