Recently, I tried out a Call of Duty editor. So far, I have been able to make a basic map and play it, but I found CoDradiant a confusing editor sometimes. Not really easy to work with. Probably because I'm not known to the controls, still, the camera movement in the editor is far from ideal.
I guess I'm going to stick with HL and then HL2, and get into engine coding a bit this vacation.
Oh, and my lightbeam tutorial will come soon...