The National Institute of Health has recently made available a new booklet with good basic information about Lewy Boedy Dementia. You can get a copy of it here: http://www.nia.nih.gov/sites/default/files/lewy_body_dementia_0.pdf (Since this is a government site and not a .com, my understanding is that it is permitted to post the url here.)
If you are caring for someone who has either Dementia with Lewy Bodies or Parkinson's Disease Dementia, or suspect that a loved one may have either, I think you will find this material worth looking at.