Thanks for the idead, guys! I actually thought that htere may have been a plugin especially for this! Doh! Lol!
Anyway, I think i’ll go with using PS layers over the top of my video. I guess that for the animated parts (I want to have a body of text referance a peice of hardware using an arrow type thing) I’ll just use an animated gif.
If I find anything to make the job easier or another way of accomplishing the effect, I’ll post my results here. Sorry it took so long to resond, I got bogged down in other work!