Team Fortress 2 is getting a lot of attention from CodeWeavers and in this forum, but people seem to be ignoring Hammer, which apparently does not work under CrossOver. :( (It's part of the Source SDK and is used to make custom maps and levels for games like TF2.)
Can people please pay more attention to it? It's a very important component of the Source SDK.
Here's a link to the forum: http://www.codeweavers.com/compatibility/browse/name/?app_id=3688;forum=1