Those who are interested: MyApertureInnovations is holding a mapping competition based around creating custom content for the game!

http://myapertureinnovations.com/filedb/contest.php

The prizes aren't much, but it might give you people some motivation to finish your maps. (ahem Habzs)

FelixGriffin wrote:
Now, are we allowed to use third-party content as well, if we include custom content? For example, a map that uses the Combine Turret model on a turret would be allowed, if it also included a custom skybox and models?

Custom Content

All entries should use custom content of some sort
(textures, models, particles, sounds, or any combination thereof)

Content must be made by a team member and not a third party
Content must be exclusively for the map. No stock sounds or textures.

guess not, but better ask there then here

A contest based on custom content? Maybe I'll finish the map. xD