The first trailer for "Clastle" is up on the game's Indie DB page. Here's the process I went in creating it.
First I came up with the concept of the character's death being the two beats of sound after I had so much fun seeing people's expressions to the variety of way the character can die. The song I picked was essitianlly perfect because that pattern repeats throughout the whole song.
Next I needed to find software for screen capturing. I went through lots of programs before finding fraps . It works well, but the free version has a watermark near the top. If you crop the image though, it disappears. After recording, I needed to find software to convert the AVI files FRAPs made and turn them into quicktime movie files so I could use Final Cut Pro, and Apple Motion 3 on a MAC.
I found this program that works wonderfully at the task. Then, I edited the video, added music, etc, and finished the first trailer.