Ahh ok. Got you now
Um, for the trailers, at the moment, I just use iMovie for editing, and then run it through light works for colourings and effects, but I'm trying to save up for Final Cut Pro so I can do an even better job of it on just one application.
For covers I just use photoshop... And that's it basically!
Not sure if this was helpful... Just ask me if you want to know anything else :)