Yabbas asked (and I am answering them here for fairness)

1) Can I submit more than one entry to maximise my chances?

One per person. Sorry!

2) I've got loads of ideas - most of the videos up now only demonstrate ONE feature of the ITTs - must I only show ONE feature in a video or can I demonstrate loads of different features?

Use your judgement.

3) Can ideas come from copyrighted sources (say for instance - can I replicate TV adverts for other devices but using the ITT instead...)

Like an Apple ad? That'd be funny. Stick with YouTube's TOS on copyrights and you'll be good.

4) Is comedy seen in a good or a bad light?

I love it. I'm not the only judge though.

5) Maximum length of a video entry?

Stay within YouTube's limit.

6) Can I include music/sound effects in mine?

Go right ahead. Impressing people will get votes.