I haven't tried out the Steam Workshop yet, but a friend of mine with Skyrim says that it is fantastic for giving you easy access to user generator content. Therefore, this recent news that Portal 2 will gain Steam Workshop support with a reasonably user-friendly map creator sounds great!
http://www.pcgamer.com/2012/03/14/porta ... -workshop/
Portal 2 to get Steam Workshop support
Portal 2 to get Steam Workshop support
My contributions to the Racketboy site:
Browser Games ... Free PC Games ... Mixtapes ... Doujin Games ... SotC Poetry
Browser Games ... Free PC Games ... Mixtapes ... Doujin Games ... SotC Poetry