[quote name='Jake Gilla' timestamp='1304715982' post='4807489']
When it comes to modding, I have the Source SDK, but it appears that I can only Mod games I own, so I'm stuck with just Portal for the time being. I've heard that a Portal 2 SDK should be released soon which would be great, and I'll probably buy Orange Box or the Left 4 Dead pack to open up a few more options.
Any recommendations for books, video tutorials, etc when it comes to Hammer? Even some information on modding in general would be good. I don't have much experience with the community, except some music I did for a friends Counter-Strike Mod back in high school.
I can recommend you warcraft 3 or starcraft II for modding purposes. There is a pretty big community supporting modding and in addition there are already good mods existing, like defense of the ancient (dota) for example.