I found this research document very useful



It's a bit academic, but it just about covers every current piece of research in dementia - drug treatments, non-drug intervention, respite care, nursing homes, caregiver support. If you can plough though the medical jargon, I actually found some very useful things that I'd never considered.
For instance, there's a piece of research showing positive outcomes for playing 'nature noises' to encourage sufferers to eat. The research on Vit E and gingko is looked into, as are all kinds of wonderful practical interventions - like what works best to prevent incontinence.
It's in PDF form.