Well with photoshop you can ad effects as shadows and artificial blue screens.(i use the blue screen effect a lot check out the tut's on http://www.nccinema.ch
you can also create lightsabers and balls with it but you need to do it with ervery frame in your movie no tweening opr something like that so if your movie is 30 frame a second it can take a while.(like 20 years)
but there is an angel alamdv.
it is to bad that my dad won't let me by it
but someday i will get it