I think it is generally useful for people to have a picture in their head about whats going on as work quite frequently gets lead by instinct and educated guess

I think it is generally useful for people to have a picture in their head about whats going on as work quite frequently gets lead by instinct and educated guesswork which can be made rigorous once you've decided its worth the time to do so. That said I really don't understand the appeal of Bohmian mechanics. The explicit non-locality puts me off it. On a more positive note the stuff about category theory is very interesting and I think has a lot to offer physics in general and quantum mechanics in particular. I found a couple of papers by Bob Coecke made a good introduction to the use of categories for a physicist: 1) http://arxiv.org/abs/0908.1787 http://arxiv.org/abs/0908.1787 2) http://arxiv.org/abs/0808.1032 http://arxiv.org/abs/0808.1032